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Simplifying 3(x + -1) = -9(x + 7) Reorder the terms: 3(-1 + x) = -9(x + 7) (-1 * 3 + x * 3) = -9(x + 7) (-3 + 3x) = -9(x + 7) Reorder the terms: -3 + 3x = -9(7 + x) -3 + 3x = (7 * -9 + x * -9) -3 + 3x = (-63 + -9x) Solving -3 + 3x = -63 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. -3 + 3x + 9x = -63 + -9x + 9x Combine like terms: 3x + 9x = 12x -3 + 12x = -63 + -9x + 9x Combine like terms: -9x + 9x = 0 -3 + 12x = -63 + 0 -3 + 12x = -63 Add '3' to each side of the equation. -3 + 3 + 12x = -63 + 3 Combine like terms: -3 + 3 = 0 0 + 12x = -63 + 3 12x = -63 + 3 Combine like terms: -63 + 3 = -60 12x = -60 Divide each side by '12'. x = -5 Simplifying x = -5
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