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Simplifying -2(6x + -3) + 9 = -12x + 15 Reorder the terms: -2(-3 + 6x) + 9 = -12x + 15 (-3 * -2 + 6x * -2) + 9 = -12x + 15 (6 + -12x) + 9 = -12x + 15 Reorder the terms: 6 + 9 + -12x = -12x + 15 Combine like terms: 6 + 9 = 15 15 + -12x = -12x + 15 Reorder the terms: 15 + -12x = 15 + -12x Add '-15' to each side of the equation. 15 + -15 + -12x = 15 + -15 + -12x Combine like terms: 15 + -15 = 0 0 + -12x = 15 + -15 + -12x -12x = 15 + -15 + -12x Combine like terms: 15 + -15 = 0 -12x = 0 + -12x -12x = -12x Add '12x' to each side of the equation. -12x + 12x = -12x + 12x Combine like terms: -12x + 12x = 0 0 = -12x + 12x Combine like terms: -12x + 12x = 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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