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Simplifying 80 = 2x + 2(x + -1) Reorder the terms: 80 = 2x + 2(-1 + x) 80 = 2x + (-1 * 2 + x * 2) 80 = 2x + (-2 + 2x) Reorder the terms: 80 = -2 + 2x + 2x Combine like terms: 2x + 2x = 4x 80 = -2 + 4x Solving 80 = -2 + 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. 80 + -4x = -2 + 4x + -4x Combine like terms: 4x + -4x = 0 80 + -4x = -2 + 0 80 + -4x = -2 Add '-80' to each side of the equation. 80 + -80 + -4x = -2 + -80 Combine like terms: 80 + -80 = 0 0 + -4x = -2 + -80 -4x = -2 + -80 Combine like terms: -2 + -80 = -82 -4x = -82 Divide each side by '-4'. x = 20.5 Simplifying x = 20.5
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