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Simplifying 3x + -18 + -15x = 126 Reorder the terms: -18 + 3x + -15x = 126 Combine like terms: 3x + -15x = -12x -18 + -12x = 126 Solving -18 + -12x = 126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + -12x = 126 + 18 Combine like terms: -18 + 18 = 0 0 + -12x = 126 + 18 -12x = 126 + 18 Combine like terms: 126 + 18 = 144 -12x = 144 Divide each side by '-12'. x = -12 Simplifying x = -12
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