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Simplifying 10x + -30 + 9x + -12 = 129 Reorder the terms: -30 + -12 + 10x + 9x = 129 Combine like terms: -30 + -12 = -42 -42 + 10x + 9x = 129 Combine like terms: 10x + 9x = 19x -42 + 19x = 129 Solving -42 + 19x = 129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '42' to each side of the equation. -42 + 42 + 19x = 129 + 42 Combine like terms: -42 + 42 = 0 0 + 19x = 129 + 42 19x = 129 + 42 Combine like terms: 129 + 42 = 171 19x = 171 Divide each side by '19'. x = 9 Simplifying x = 9
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