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Simplifying 15 + 9x = 7 + -1x Solving 15 + 9x = 7 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 15 + 9x + x = 7 + -1x + x Combine like terms: 9x + x = 10x 15 + 10x = 7 + -1x + x Combine like terms: -1x + x = 0 15 + 10x = 7 + 0 15 + 10x = 7 Add '-15' to each side of the equation. 15 + -15 + 10x = 7 + -15 Combine like terms: 15 + -15 = 0 0 + 10x = 7 + -15 10x = 7 + -15 Combine like terms: 7 + -15 = -8 10x = -8 Divide each side by '10'. x = -0.8 Simplifying x = -0.8
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