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Simplifying 4x + -1(5x + -7) = 20 Reorder the terms: 4x + -1(-7 + 5x) = 20 4x + (-7 * -1 + 5x * -1) = 20 4x + (7 + -5x) = 20 Reorder the terms: 7 + 4x + -5x = 20 Combine like terms: 4x + -5x = -1x 7 + -1x = 20 Solving 7 + -1x = 20 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 + -1x = 20 + -7 Combine like terms: 7 + -7 = 0 0 + -1x = 20 + -7 -1x = 20 + -7 Combine like terms: 20 + -7 = 13 -1x = 13 Divide each side by '-1'. x = -13 Simplifying x = -13
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