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Simplifying 9x + -1(7x + -1) = 2x + 1 Reorder the terms: 9x + -1(-1 + 7x) = 2x + 1 9x + (-1 * -1 + 7x * -1) = 2x + 1 9x + (1 + -7x) = 2x + 1 Reorder the terms: 1 + 9x + -7x = 2x + 1 Combine like terms: 9x + -7x = 2x 1 + 2x = 2x + 1 Reorder the terms: 1 + 2x = 1 + 2x Add '-1' to each side of the equation. 1 + -1 + 2x = 1 + -1 + 2x Combine like terms: 1 + -1 = 0 0 + 2x = 1 + -1 + 2x 2x = 1 + -1 + 2x Combine like terms: 1 + -1 = 0 2x = 0 + 2x 2x = 2x Add '-2x' to each side of the equation. 2x + -2x = 2x + -2x Combine like terms: 2x + -2x = 0 0 = 2x + -2x Combine like terms: 2x + -2x = 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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