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Simplifying 6x + 3(x + -7) = -129 Reorder the terms: 6x + 3(-7 + x) = -129 6x + (-7 * 3 + x * 3) = -129 6x + (-21 + 3x) = -129 Reorder the terms: -21 + 6x + 3x = -129 Combine like terms: 6x + 3x = 9x -21 + 9x = -129 Solving -21 + 9x = -129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 9x = -129 + 21 Combine like terms: -21 + 21 = 0 0 + 9x = -129 + 21 9x = -129 + 21 Combine like terms: -129 + 21 = -108 9x = -108 Divide each side by '9'. x = -12 Simplifying x = -12
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