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