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Simplifying (-45 + d) + (500 + -1d) = 215 Remove parenthesis around (-45 + d) -45 + d + (500 + -1d) = 215 Remove parenthesis around (500 + -1d) -45 + d + 500 + -1d = 215 Reorder the terms: -45 + 500 + d + -1d = 215 Combine like terms: -45 + 500 = 455 455 + d + -1d = 215 Combine like terms: d + -1d = 0 455 + 0 = 215 455 = 215 Solving 455 = 215 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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