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Simplifying (x + -20) = (4x + 15) Reorder the terms: (-20 + x) = (4x + 15) Remove parenthesis around (-20 + x) -20 + x = (4x + 15) Reorder the terms: -20 + x = (15 + 4x) Remove parenthesis around (15 + 4x) -20 + x = 15 + 4x Solving -20 + x = 15 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. -20 + x + -4x = 15 + 4x + -4x Combine like terms: x + -4x = -3x -20 + -3x = 15 + 4x + -4x Combine like terms: 4x + -4x = 0 -20 + -3x = 15 + 0 -20 + -3x = 15 Add '20' to each side of the equation. -20 + 20 + -3x = 15 + 20 Combine like terms: -20 + 20 = 0 0 + -3x = 15 + 20 -3x = 15 + 20 Combine like terms: 15 + 20 = 35 -3x = 35 Divide each side by '-3'. x = -11.66666667 Simplifying x = -11.66666667
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