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Simplifying 12x + 5 = 4(3x + -1) + 9 Reorder the terms: 5 + 12x = 4(3x + -1) + 9 Reorder the terms: 5 + 12x = 4(-1 + 3x) + 9 5 + 12x = (-1 * 4 + 3x * 4) + 9 5 + 12x = (-4 + 12x) + 9 Reorder the terms: 5 + 12x = -4 + 9 + 12x Combine like terms: -4 + 9 = 5 5 + 12x = 5 + 12x Add '-5' to each side of the equation. 5 + -5 + 12x = 5 + -5 + 12x Combine like terms: 5 + -5 = 0 0 + 12x = 5 + -5 + 12x 12x = 5 + -5 + 12x Combine like terms: 5 + -5 = 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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