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Simplifying (10x + y) + -1(x + y) = 9x Remove parenthesis around (10x + y) 10x + y + -1(x + y) = 9x 10x + y + (x * -1 + y * -1) = 9x 10x + y + (-1x + -1y) = 9x Reorder the terms: 10x + -1x + y + -1y = 9x Combine like terms: 10x + -1x = 9x 9x + y + -1y = 9x Combine like terms: y + -1y = 0 9x + 0 = 9x 9x = 9x Add '-9x' to each side of the equation. 9x + -9x = 9x + -9x Combine like terms: 9x + -9x = 0 0 = 9x + -9x Combine like terms: 9x + -9x = 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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