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Simplifying -12 + 9 = -3(x + 7) Combine like terms: -12 + 9 = -3 -3 = -3(x + 7) Reorder the terms: -3 = -3(7 + x) -3 = (7 * -3 + x * -3) -3 = (-21 + -3x) Solving -3 = -21 + -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. -3 + 3x = -21 + -3x + 3x Combine like terms: -3x + 3x = 0 -3 + 3x = -21 + 0 -3 + 3x = -21 Add '3' to each side of the equation. -3 + 3 + 3x = -21 + 3 Combine like terms: -3 + 3 = 0 0 + 3x = -21 + 3 3x = -21 + 3 Combine like terms: -21 + 3 = -18 3x = -18 Divide each side by '3'. x = -6 Simplifying x = -6
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