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Simplifying 4(3x + 7) + -1(12x + 7) = 21 Reorder the terms: 4(7 + 3x) + -1(12x + 7) = 21 (7 * 4 + 3x * 4) + -1(12x + 7) = 21 (28 + 12x) + -1(12x + 7) = 21 Reorder the terms: 28 + 12x + -1(7 + 12x) = 21 28 + 12x + (7 * -1 + 12x * -1) = 21 28 + 12x + (-7 + -12x) = 21 Reorder the terms: 28 + -7 + 12x + -12x = 21 Combine like terms: 28 + -7 = 21 21 + 12x + -12x = 21 Combine like terms: 12x + -12x = 0 21 + 0 = 21 21 = 21 Add '-21' to each side of the equation. 21 + -21 = 21 + -21 Combine like terms: 21 + -21 = 0 0 = 21 + -21 Combine like terms: 21 + -21 = 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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