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Simplifying 20 + -1x = (x + -4) Reorder the terms: 20 + -1x = (-4 + x) Remove parenthesis around (-4 + x) 20 + -1x = -4 + x Solving 20 + -1x = -4 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 20 + -1x + -1x = -4 + x + -1x Combine like terms: -1x + -1x = -2x 20 + -2x = -4 + x + -1x Combine like terms: x + -1x = 0 20 + -2x = -4 + 0 20 + -2x = -4 Add '-20' to each side of the equation. 20 + -20 + -2x = -4 + -20 Combine like terms: 20 + -20 = 0 0 + -2x = -4 + -20 -2x = -4 + -20 Combine like terms: -4 + -20 = -24 -2x = -24 Divide each side by '-2'. x = 12 Simplifying x = 12
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