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Simplifying 3 + -1(3x + 12) = 39 + -9x Reorder the terms: 3 + -1(12 + 3x) = 39 + -9x 3 + (12 * -1 + 3x * -1) = 39 + -9x 3 + (-12 + -3x) = 39 + -9x Combine like terms: 3 + -12 = -9 -9 + -3x = 39 + -9x Solving -9 + -3x = 39 + -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. -9 + -3x + 9x = 39 + -9x + 9x Combine like terms: -3x + 9x = 6x -9 + 6x = 39 + -9x + 9x Combine like terms: -9x + 9x = 0 -9 + 6x = 39 + 0 -9 + 6x = 39 Add '9' to each side of the equation. -9 + 9 + 6x = 39 + 9 Combine like terms: -9 + 9 = 0 0 + 6x = 39 + 9 6x = 39 + 9 Combine like terms: 39 + 9 = 48 6x = 48 Divide each side by '6'. x = 8 Simplifying x = 8
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