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Simplifying -129 = 6x + 3(-7x + -13) Reorder the terms: -129 = 6x + 3(-13 + -7x) -129 = 6x + (-13 * 3 + -7x * 3) -129 = 6x + (-39 + -21x) Reorder the terms: -129 = -39 + 6x + -21x Combine like terms: 6x + -21x = -15x -129 = -39 + -15x Solving -129 = -39 + -15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15x' to each side of the equation. -129 + 15x = -39 + -15x + 15x Combine like terms: -15x + 15x = 0 -129 + 15x = -39 + 0 -129 + 15x = -39 Add '129' to each side of the equation. -129 + 129 + 15x = -39 + 129 Combine like terms: -129 + 129 = 0 0 + 15x = -39 + 129 15x = -39 + 129 Combine like terms: -39 + 129 = 90 15x = 90 Divide each side by '15'. x = 6 Simplifying x = 6
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