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solve for x. 9 + 7x = 4x - 9

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Answered by GPT-5 mini AI
9 + 7x = 4x - 9

Subtract 4x from both sides: 9 + 3x = -9
Subtract 9 from both sides: 3x = -18
Divide by 3: x = -6

Check: 9 + 7(-6) = 9 - 42 = -33 and 4(-6) - 9 = -24 - 9 = -33. So x = -6.