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Simplifying (80 + -1x) + (90 + -2x) = 180 Remove parenthesis around (80 + -1x) 80 + -1x + (90 + -2x) = 180 Remove parenthesis around (90 + -2x) 80 + -1x + 90 + -2x = 180 Reorder the terms: 80 + 90 + -1x + -2x = 180 Combine like terms: 80 + 90 = 170 170 + -1x + -2x = 180 Combine like terms: -1x + -2x = -3x 170 + -3x = 180 Solving 170 + -3x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-170' to each side of the equation. 170 + -170 + -3x = 180 + -170 Combine like terms: 170 + -170 = 0 0 + -3x = 180 + -170 -3x = 180 + -170 Combine like terms: 180 + -170 = 10 -3x = 10 Divide each side by '-3'. x = -3.333333333 Simplifying x = -3.333333333
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