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Simplifying -2x + -1(20 + 2x) + 2(x + -1) = -4 -2x + (20 * -1 + 2x * -1) + 2(x + -1) = -4 -2x + (-20 + -2x) + 2(x + -1) = -4 Reorder the terms: -2x + -20 + -2x + 2(-1 + x) = -4 -2x + -20 + -2x + (-1 * 2 + x * 2) = -4 -2x + -20 + -2x + (-2 + 2x) = -4 Reorder the terms: -20 + -2 + -2x + -2x + 2x = -4 Combine like terms: -20 + -2 = -22 -22 + -2x + -2x + 2x = -4 Combine like terms: -2x + -2x = -4x -22 + -4x + 2x = -4 Combine like terms: -4x + 2x = -2x -22 + -2x = -4 Solving -22 + -2x = -4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '22' to each side of the equation. -22 + 22 + -2x = -4 + 22 Combine like terms: -22 + 22 = 0 0 + -2x = -4 + 22 -2x = -4 + 22 Combine like terms: -4 + 22 = 18 -2x = 18 Divide each side by '-2'. x = -9 Simplifying x = -9
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