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Simplifying 21 + -12 = 3(x + -5) Combine like terms: 21 + -12 = 9 9 = 3(x + -5) Reorder the terms: 9 = 3(-5 + x) 9 = (-5 * 3 + x * 3) 9 = (-15 + 3x) Solving 9 = -15 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 9 + -3x = -15 + 3x + -3x Combine like terms: 3x + -3x = 0 9 + -3x = -15 + 0 9 + -3x = -15 Add '-9' to each side of the equation. 9 + -9 + -3x = -15 + -9 Combine like terms: 9 + -9 = 0 0 + -3x = -15 + -9 -3x = -15 + -9 Combine like terms: -15 + -9 = -24 -3x = -24 Divide each side by '-3'. x = 8 Simplifying x = 8
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