Solve for x: 3x + 5 = 20.

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Multiple Choice

Solve for x: 3x + 5 = 20.

Explanation:
The problem tests solving a simple linear equation by isolating the variable. To undo the extra 5 added to 3x, subtract 5 from both sides: 3x = 15. Then undo the multiplication by 3 by dividing both sides by 3, giving x = 5. Checking: 3(5) + 5 = 15 + 5 = 20, which matches the right side. So the value of x is 5. If you plug in any other number, the left side wouldn’t equal 20.

The problem tests solving a simple linear equation by isolating the variable. To undo the extra 5 added to 3x, subtract 5 from both sides: 3x = 15. Then undo the multiplication by 3 by dividing both sides by 3, giving x = 5. Checking: 3(5) + 5 = 15 + 5 = 20, which matches the right side. So the value of x is 5. If you plug in any other number, the left side wouldn’t equal 20.

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