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Simplifying 20 + -5(x + 1) + 3x = -1(2x + -15) Reorder the terms: 20 + -5(1 + x) + 3x = -1(2x + -15) 20 + (1 * -5 + x * -5) + 3x = -1(2x + -15) 20 + (-5 + -5x) + 3x = -1(2x + -15) Combine like terms: 20 + -5 = 15 15 + -5x + 3x = -1(2x + -15) Combine like terms: -5x + 3x = -2x 15 + -2x = -1(2x + -15) Reorder the terms: 15 + -2x = -1(-15 + 2x) 15 + -2x = (-15 * -1 + 2x * -1) 15 + -2x = (15 + -2x) Add '-15' to each side of the equation. 15 + -15 + -2x = 15 + -15 + -2x Combine like terms: 15 + -15 = 0 0 + -2x = 15 + -15 + -2x -2x = 15 + -15 + -2x Combine like terms: 15 + -15 = 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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