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Simplifying 7 + 9x = -9 + x Solving 7 + 9x = -9 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 7 + 9x + -1x = -9 + x + -1x Combine like terms: 9x + -1x = 8x 7 + 8x = -9 + x + -1x Combine like terms: x + -1x = 0 7 + 8x = -9 + 0 7 + 8x = -9 Add '-7' to each side of the equation. 7 + -7 + 8x = -9 + -7 Combine like terms: 7 + -7 = 0 0 + 8x = -9 + -7 8x = -9 + -7 Combine like terms: -9 + -7 = -16 8x = -16 Divide each side by '8'. x = -2 Simplifying x = -2
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