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Simplifying 90 + -1x = 180 + -1x Add 'x' to each side of the equation. 90 + -1x + x = 180 + -1x + x Combine like terms: -1x + x = 0 90 + 0 = 180 + -1x + x 90 = 180 + -1x + x Combine like terms: -1x + x = 0 90 = 180 + 0 90 = 180 Solving 90 = 180 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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