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Simplifying 180 + -1x = 90 + (90 + -1x) Remove parenthesis around (90 + -1x) 180 + -1x = 90 + 90 + -1x Combine like terms: 90 + 90 = 180 180 + -1x = 180 + -1x Add '-180' to each side of the equation. 180 + -180 + -1x = 180 + -180 + -1x Combine like terms: 180 + -180 = 0 0 + -1x = 180 + -180 + -1x -1x = 180 + -180 + -1x Combine like terms: 180 + -180 = 0 -1x = 0 + -1x -1x = -1x Add 'x' to each side of the equation. -1x + x = -1x + x Combine like terms: -1x + x = 0 0 = -1x + x Combine like terms: -1x + x = 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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