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Simplifying 4(3x + 5) + -1(12x + 7) = 13 Reorder the terms: 4(5 + 3x) + -1(12x + 7) = 13 (5 * 4 + 3x * 4) + -1(12x + 7) = 13 (20 + 12x) + -1(12x + 7) = 13 Reorder the terms: 20 + 12x + -1(7 + 12x) = 13 20 + 12x + (7 * -1 + 12x * -1) = 13 20 + 12x + (-7 + -12x) = 13 Reorder the terms: 20 + -7 + 12x + -12x = 13 Combine like terms: 20 + -7 = 13 13 + 12x + -12x = 13 Combine like terms: 12x + -12x = 0 13 + 0 = 13 13 = 13 Add '-13' to each side of the equation. 13 + -13 = 13 + -13 Combine like terms: 13 + -13 = 0 0 = 13 + -13 Combine like terms: 13 + -13 = 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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