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Simplifying (78 + -1x) + (87 + -2x) = 180 Remove parenthesis around (78 + -1x) 78 + -1x + (87 + -2x) = 180 Remove parenthesis around (87 + -2x) 78 + -1x + 87 + -2x = 180 Reorder the terms: 78 + 87 + -1x + -2x = 180 Combine like terms: 78 + 87 = 165 165 + -1x + -2x = 180 Combine like terms: -1x + -2x = -3x 165 + -3x = 180 Solving 165 + -3x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-165' to each side of the equation. 165 + -165 + -3x = 180 + -165 Combine like terms: 165 + -165 = 0 0 + -3x = 180 + -165 -3x = 180 + -165 Combine like terms: 180 + -165 = 15 -3x = 15 Divide each side by '-3'. x = -5 Simplifying x = -5
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