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Simplifying (12x + 21) + -1(12x + -20) = 0 Reorder the terms: (21 + 12x) + -1(12x + -20) = 0 Remove parenthesis around (21 + 12x) 21 + 12x + -1(12x + -20) = 0 Reorder the terms: 21 + 12x + -1(-20 + 12x) = 0 21 + 12x + (-20 * -1 + 12x * -1) = 0 21 + 12x + (20 + -12x) = 0 Reorder the terms: 21 + 20 + 12x + -12x = 0 Combine like terms: 21 + 20 = 41 41 + 12x + -12x = 0 Combine like terms: 12x + -12x = 0 41 + 0 = 0 41 = 0 Solving 41 = 0 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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