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Simplifying -12x + -15 = 21 + -10x Reorder the terms: -15 + -12x = 21 + -10x Solving -15 + -12x = 21 + -10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10x' to each side of the equation. -15 + -12x + 10x = 21 + -10x + 10x Combine like terms: -12x + 10x = -2x -15 + -2x = 21 + -10x + 10x Combine like terms: -10x + 10x = 0 -15 + -2x = 21 + 0 -15 + -2x = 21 Add '15' to each side of the equation. -15 + 15 + -2x = 21 + 15 Combine like terms: -15 + 15 = 0 0 + -2x = 21 + 15 -2x = 21 + 15 Combine like terms: 21 + 15 = 36 -2x = 36 Divide each side by '-2'. x = -18 Simplifying x = -18
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