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Simplifying 2x + 7 + 10x + -9 = 142 Reorder the terms: 7 + -9 + 2x + 10x = 142 Combine like terms: 7 + -9 = -2 -2 + 2x + 10x = 142 Combine like terms: 2x + 10x = 12x -2 + 12x = 142 Solving -2 + 12x = 142 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 12x = 142 + 2 Combine like terms: -2 + 2 = 0 0 + 12x = 142 + 2 12x = 142 + 2 Combine like terms: 142 + 2 = 144 12x = 144 Divide each side by '12'. x = 12 Simplifying x = 12
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