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Simplifying 12 + -3(x + 7) = 6x Reorder the terms: 12 + -3(7 + x) = 6x 12 + (7 * -3 + x * -3) = 6x 12 + (-21 + -3x) = 6x Combine like terms: 12 + -21 = -9 -9 + -3x = 6x Solving -9 + -3x = 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. -9 + -3x + -6x = 6x + -6x Combine like terms: -3x + -6x = -9x -9 + -9x = 6x + -6x Combine like terms: 6x + -6x = 0 -9 + -9x = 0 Add '9' to each side of the equation. -9 + 9 + -9x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -9x = 0 + 9 -9x = 0 + 9 Combine like terms: 0 + 9 = 9 -9x = 9 Divide each side by '-9'. x = -1 Simplifying x = -1
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