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Simplifying 20x + -1(7x + -2) = 15 Reorder the terms: 20x + -1(-2 + 7x) = 15 20x + (-2 * -1 + 7x * -1) = 15 20x + (2 + -7x) = 15 Reorder the terms: 2 + 20x + -7x = 15 Combine like terms: 20x + -7x = 13x 2 + 13x = 15 Solving 2 + 13x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 13x = 15 + -2 Combine like terms: 2 + -2 = 0 0 + 13x = 15 + -2 13x = 15 + -2 Combine like terms: 15 + -2 = 13 13x = 13 Divide each side by '13'. x = 1 Simplifying x = 1
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