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Simplifying 3x2 = 39x + -120 Reorder the terms: 3x2 = -120 + 39x Solving 3x2 = -120 + 39x Solving for variable 'x'. Reorder the terms: 120 + -39x + 3x2 = -120 + 39x + 120 + -39x Reorder the terms: 120 + -39x + 3x2 = -120 + 120 + 39x + -39x Combine like terms: -120 + 120 = 0 120 + -39x + 3x2 = 0 + 39x + -39x 120 + -39x + 3x2 = 39x + -39x Combine like terms: 39x + -39x = 0 120 + -39x + 3x2 = 0 Factor out the Greatest Common Factor (GCF), '3'. 3(40 + -13x + x2) = 0 Factor a trinomial. 3((5 + -1x)(8 + -1x)) = 0 Ignore the factor 3.Subproblem 1
Set the factor '(5 + -1x)' equal to zero and attempt to solve: Simplifying 5 + -1x = 0 Solving 5 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -1x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1x = 0 + -5 -1x = 0 + -5 Combine like terms: 0 + -5 = -5 -1x = -5 Divide each side by '-1'. x = 5 Simplifying x = 5Subproblem 2
Set the factor '(8 + -1x)' equal to zero and attempt to solve: Simplifying 8 + -1x = 0 Solving 8 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -1x = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -1x = 0 + -8 -1x = 0 + -8 Combine like terms: 0 + -8 = -8 -1x = -8 Divide each side by '-1'. x = 8 Simplifying x = 8Solution
x = {5, 8}
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