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Simplifying 78 + (x + -3) + x = 180 Reorder the terms: 78 + (-3 + x) + x = 180 Remove parenthesis around (-3 + x) 78 + -3 + x + x = 180 Combine like terms: 78 + -3 = 75 75 + x + x = 180 Combine like terms: x + x = 2x 75 + 2x = 180 Solving 75 + 2x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-75' to each side of the equation. 75 + -75 + 2x = 180 + -75 Combine like terms: 75 + -75 = 0 0 + 2x = 180 + -75 2x = 180 + -75 Combine like terms: 180 + -75 = 105 2x = 105 Divide each side by '2'. x = 52.5 Simplifying x = 52.5
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