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Simplifying -1(7x + -8) + 1 = 2x + 9(1 + -1x) Reorder the terms: -1(-8 + 7x) + 1 = 2x + 9(1 + -1x) (-8 * -1 + 7x * -1) + 1 = 2x + 9(1 + -1x) (8 + -7x) + 1 = 2x + 9(1 + -1x) Reorder the terms: 8 + 1 + -7x = 2x + 9(1 + -1x) Combine like terms: 8 + 1 = 9 9 + -7x = 2x + 9(1 + -1x) 9 + -7x = 2x + (1 * 9 + -1x * 9) 9 + -7x = 2x + (9 + -9x) Reorder the terms: 9 + -7x = 9 + 2x + -9x Combine like terms: 2x + -9x = -7x 9 + -7x = 9 + -7x Add '-9' to each side of the equation. 9 + -9 + -7x = 9 + -9 + -7x Combine like terms: 9 + -9 = 0 0 + -7x = 9 + -9 + -7x -7x = 9 + -9 + -7x Combine like terms: 9 + -9 = 0 -7x = 0 + -7x -7x = -7x Add '7x' to each side of the equation. -7x + 7x = -7x + 7x Combine like terms: -7x + 7x = 0 0 = -7x + 7x Combine like terms: -7x + 7x = 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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