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Simplifying (15 + -4x) + -1(20 + -2x) = 0 Remove parenthesis around (15 + -4x) 15 + -4x + -1(20 + -2x) = 0 15 + -4x + (20 * -1 + -2x * -1) = 0 15 + -4x + (-20 + 2x) = 0 Reorder the terms: 15 + -20 + -4x + 2x = 0 Combine like terms: 15 + -20 = -5 -5 + -4x + 2x = 0 Combine like terms: -4x + 2x = -2x -5 + -2x = 0 Solving -5 + -2x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -2x = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -2x = 0 + 5 -2x = 0 + 5 Combine like terms: 0 + 5 = 5 -2x = 5 Divide each side by '-2'. x = -2.5 Simplifying x = -2.5
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