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Simplifying -7x + 3(-2x + 6) = -138 Reorder the terms: -7x + 3(6 + -2x) = -138 -7x + (6 * 3 + -2x * 3) = -138 -7x + (18 + -6x) = -138 Reorder the terms: 18 + -7x + -6x = -138 Combine like terms: -7x + -6x = -13x 18 + -13x = -138 Solving 18 + -13x = -138 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + -13x = -138 + -18 Combine like terms: 18 + -18 = 0 0 + -13x = -138 + -18 -13x = -138 + -18 Combine like terms: -138 + -18 = -156 -13x = -156 Divide each side by '-13'. x = 12 Simplifying x = 12
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