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Simplifying 3(2x + -1) + 3(x + 5) = 138 Reorder the terms: 3(-1 + 2x) + 3(x + 5) = 138 (-1 * 3 + 2x * 3) + 3(x + 5) = 138 (-3 + 6x) + 3(x + 5) = 138 Reorder the terms: -3 + 6x + 3(5 + x) = 138 -3 + 6x + (5 * 3 + x * 3) = 138 -3 + 6x + (15 + 3x) = 138 Reorder the terms: -3 + 15 + 6x + 3x = 138 Combine like terms: -3 + 15 = 12 12 + 6x + 3x = 138 Combine like terms: 6x + 3x = 9x 12 + 9x = 138 Solving 12 + 9x = 138 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 9x = 138 + -12 Combine like terms: 12 + -12 = 0 0 + 9x = 138 + -12 9x = 138 + -12 Combine like terms: 138 + -12 = 126 9x = 126 Divide each side by '9'. x = 14 Simplifying x = 14
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