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Simplifying -3(4x + -7) + 9 = -12x + 30 Reorder the terms: -3(-7 + 4x) + 9 = -12x + 30 (-7 * -3 + 4x * -3) + 9 = -12x + 30 (21 + -12x) + 9 = -12x + 30 Reorder the terms: 21 + 9 + -12x = -12x + 30 Combine like terms: 21 + 9 = 30 30 + -12x = -12x + 30 Reorder the terms: 30 + -12x = 30 + -12x Add '-30' to each side of the equation. 30 + -30 + -12x = 30 + -30 + -12x Combine like terms: 30 + -30 = 0 0 + -12x = 30 + -30 + -12x -12x = 30 + -30 + -12x Combine like terms: 30 + -30 = 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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