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Simplifying 3x + -1(x + -7) = 15 Reorder the terms: 3x + -1(-7 + x) = 15 3x + (-7 * -1 + x * -1) = 15 3x + (7 + -1x) = 15 Reorder the terms: 7 + 3x + -1x = 15 Combine like terms: 3x + -1x = 2x 7 + 2x = 15 Solving 7 + 2x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 2x = 15 + -7 Combine like terms: 7 + -7 = 0 0 + 2x = 15 + -7 2x = 15 + -7 Combine like terms: 15 + -7 = 8 2x = 8 Divide each side by '2'. x = 4 Simplifying x = 4
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