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Simplifying (78 + -1x) + (93 + -2x) = 180 Remove parenthesis around (78 + -1x) 78 + -1x + (93 + -2x) = 180 Remove parenthesis around (93 + -2x) 78 + -1x + 93 + -2x = 180 Reorder the terms: 78 + 93 + -1x + -2x = 180 Combine like terms: 78 + 93 = 171 171 + -1x + -2x = 180 Combine like terms: -1x + -2x = -3x 171 + -3x = 180 Solving 171 + -3x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-171' to each side of the equation. 171 + -171 + -3x = 180 + -171 Combine like terms: 171 + -171 = 0 0 + -3x = 180 + -171 -3x = 180 + -171 Combine like terms: 180 + -171 = 9 -3x = 9 Divide each side by '-3'. x = -3 Simplifying x = -3
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