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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 = 27 -1x = 27 Divide each side by '-1'. x = -27 Simplifying x = -27
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