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Simplifying 5 + -1x + 2 = 7 + -1x Reorder the terms: 5 + 2 + -1x = 7 + -1x Combine like terms: 5 + 2 = 7 7 + -1x = 7 + -1x Add '-7' to each side of the equation. 7 + -7 + -1x = 7 + -7 + -1x Combine like terms: 7 + -7 = 0 0 + -1x = 7 + -7 + -1x -1x = 7 + -7 + -1x Combine like terms: 7 + -7 = 0 -1x = 0 + -1x -1x = -1x Add 'x' to each side of the equation. -1x + x = -1x + x Combine like terms: -1x + x = 0 0 = -1x + x Combine like terms: -1x + x = 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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