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Simplifying 7 + x = 3x + 9 Reorder the terms: 7 + x = 9 + 3x Solving 7 + x = 9 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 7 + x + -3x = 9 + 3x + -3x Combine like terms: x + -3x = -2x 7 + -2x = 9 + 3x + -3x Combine like terms: 3x + -3x = 0 7 + -2x = 9 + 0 7 + -2x = 9 Add '-7' to each side of the equation. 7 + -7 + -2x = 9 + -7 Combine like terms: 7 + -7 = 0 0 + -2x = 9 + -7 -2x = 9 + -7 Combine like terms: 9 + -7 = 2 -2x = 2 Divide each side by '-2'. x = -1 Simplifying x = -1
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