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Simplifying (180 + -1x) + -1(90 + -1x) = 90 Remove parenthesis around (180 + -1x) 180 + -1x + -1(90 + -1x) = 90 180 + -1x + (90 * -1 + -1x * -1) = 90 180 + -1x + (-90 + 1x) = 90 Reorder the terms: 180 + -90 + -1x + 1x = 90 Combine like terms: 180 + -90 = 90 90 + -1x + 1x = 90 Combine like terms: -1x + 1x = 0 90 + 0 = 90 90 = 90 Add '-90' to each side of the equation. 90 + -90 = 90 + -90 Combine like terms: 90 + -90 = 0 0 = 90 + -90 Combine like terms: 90 + -90 = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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