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Simplifying 12x + -1(3x + -4) = 9x + 4 Reorder the terms: 12x + -1(-4 + 3x) = 9x + 4 12x + (-4 * -1 + 3x * -1) = 9x + 4 12x + (4 + -3x) = 9x + 4 Reorder the terms: 4 + 12x + -3x = 9x + 4 Combine like terms: 12x + -3x = 9x 4 + 9x = 9x + 4 Reorder the terms: 4 + 9x = 4 + 9x Add '-4' to each side of the equation. 4 + -4 + 9x = 4 + -4 + 9x Combine like terms: 4 + -4 = 0 0 + 9x = 4 + -4 + 9x 9x = 4 + -4 + 9x Combine like terms: 4 + -4 = 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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