Solve 3x + 5 = 20 Step-by-Step

2025/07/25·StepFun can make mistakes, check important info.

Solve the equation: $$

Reason

思考过程

I need to solve the equation: $3 x + 5 = 20$ . It's a simple linear equation. I'll solve for x step by step.

First, I want to isolate x on one side of the equation. Right now, x is on the left side with a coefficient of 3, and there's a constant term. I'll undo the addition of 5 by subtracting 5 from both sides. That should cancel out the +5 on the left.

So, subtracting 5 from both sides:

$3 x + 5 - 5 = 20 - 5$

That simplifies to:

$3 x = 15$

Now, I have 3 times x equals 15. To solve for x, I need to undo the multiplication by 3. I'll divide both sides by 3.

So, dividing both sides by 3:

$\frac{3 x}{3} = \frac{15}{3}$

That simplifies to:

$x = 5$

I should check if this is correct. Plugging back into the original equation: 3 times 5 is 15, plus 5 is 20. Yes, that equals 20. Perfect.

The equation is straightforward, and I got x = 5. I think that's the answer.

To solve the equation $3 x + 5 = 20$ , follow these steps to isolate $x$ :

Subtract 5 from both sides to eliminate the constant term on the left:

$3 x + 5 - 5 = 20 - 5$

Simplifying both sides gives:

$3 x = 15$

Divide both sides by 3 to solve for $x$ :

$\frac{3 x}{3} = \frac{15}{3}$

Simplifying both sides gives:

$x = 5$

Verification:

Substitute $x = 5$ back into the original equation:

$3 (5) + 5 = 15 + 5 = 20$

This matches the right side of the equation, confirming the solution is correct.

Solution: $x = 5$