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Simplifying x + (90 + x) = x + -1(90 + -1x) + 72 Remove parenthesis around (90 + x) x + 90 + x = x + -1(90 + -1x) + 72 Reorder the terms: 90 + x + x = x + -1(90 + -1x) + 72 Combine like terms: x + x = 2x 90 + 2x = x + -1(90 + -1x) + 72 90 + 2x = x + (90 * -1 + -1x * -1) + 72 90 + 2x = x + (-90 + 1x) + 72 Reorder the terms: 90 + 2x = -90 + 72 + x + 1x Combine like terms: -90 + 72 = -18 90 + 2x = -18 + x + 1x Combine like terms: x + 1x = 2x 90 + 2x = -18 + 2x Add '-2x' to each side of the equation. 90 + 2x + -2x = -18 + 2x + -2x Combine like terms: 2x + -2x = 0 90 + 0 = -18 + 2x + -2x 90 = -18 + 2x + -2x Combine like terms: 2x + -2x = 0 90 = -18 + 0 90 = -18 Solving 90 = -18 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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