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Simplifying -3(3x + -4) + 7 = -9x + 19 Reorder the terms: -3(-4 + 3x) + 7 = -9x + 19 (-4 * -3 + 3x * -3) + 7 = -9x + 19 (12 + -9x) + 7 = -9x + 19 Reorder the terms: 12 + 7 + -9x = -9x + 19 Combine like terms: 12 + 7 = 19 19 + -9x = -9x + 19 Reorder the terms: 19 + -9x = 19 + -9x Add '-19' to each side of the equation. 19 + -19 + -9x = 19 + -19 + -9x Combine like terms: 19 + -19 = 0 0 + -9x = 19 + -19 + -9x -9x = 19 + -19 + -9x Combine like terms: 19 + -19 = 0 -9x = 0 + -9x -9x = -9x Add '9x' to each side of the equation. -9x + 9x = -9x + 9x Combine like terms: -9x + 9x = 0 0 = -9x + 9x Combine like terms: -9x + 9x = 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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