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