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Simplifying 15x2 + 130x + 168 = -7 Reorder the terms: 168 + 130x + 15x2 = -7 Solving 168 + 130x + 15x2 = -7 Solving for variable 'x'. Reorder the terms: 168 + 7 + 130x + 15x2 = -7 + 7 Combine like terms: 168 + 7 = 175 175 + 130x + 15x2 = -7 + 7 Combine like terms: -7 + 7 = 0 175 + 130x + 15x2 = 0 Factor out the Greatest Common Factor (GCF), '5'. 5(35 + 26x + 3x2) = 0 Factor a trinomial. 5((7 + x)(5 + 3x)) = 0 Ignore the factor 5.Subproblem 1
Set the factor '(7 + x)' equal to zero and attempt to solve: Simplifying 7 + x = 0 Solving 7 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + x = 0 + -7 x = 0 + -7 Combine like terms: 0 + -7 = -7 x = -7 Simplifying x = -7Subproblem 2
Set the factor '(5 + 3x)' equal to zero and attempt to solve: Simplifying 5 + 3x = 0 Solving 5 + 3x = 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 + 3x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 3x = 0 + -5 3x = 0 + -5 Combine like terms: 0 + -5 = -5 3x = -5 Divide each side by '3'. x = -1.666666667 Simplifying x = -1.666666667Solution
x = {-7, -1.666666667}
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