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Simplifying 12x = -12 + -3(-4 + -4x) 12x = -12 + (-4 * -3 + -4x * -3) 12x = -12 + (12 + 12x) Combine like terms: -12 + 12 = 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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