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Simplifying (5x + -2) + (x2 + 8) = 90 Reorder the terms: (-2 + 5x) + (x2 + 8) = 90 Remove parenthesis around (-2 + 5x) -2 + 5x + (x2 + 8) = 90 Reorder the terms: -2 + 5x + (8 + x2) = 90 Remove parenthesis around (8 + x2) -2 + 5x + 8 + x2 = 90 Reorder the terms: -2 + 8 + 5x + x2 = 90 Combine like terms: -2 + 8 = 6 6 + 5x + x2 = 90 Solving 6 + 5x + x2 = 90 Solving for variable 'x'. Reorder the terms: 6 + -90 + 5x + x2 = 90 + -90 Combine like terms: 6 + -90 = -84 -84 + 5x + x2 = 90 + -90 Combine like terms: 90 + -90 = 0 -84 + 5x + x2 = 0 Factor a trinomial. (-12 + -1x)(7 + -1x) = 0Subproblem 1
Set the factor '(-12 + -1x)' equal to zero and attempt to solve: Simplifying -12 + -1x = 0 Solving -12 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + -1x = 0 + 12 Combine like terms: -12 + 12 = 0 0 + -1x = 0 + 12 -1x = 0 + 12 Combine like terms: 0 + 12 = 12 -1x = 12 Divide each side by '-1'. x = -12 Simplifying x = -12Subproblem 2
Set the factor '(7 + -1x)' equal to zero and attempt to solve: Simplifying 7 + -1x = 0 Solving 7 + -1x = 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 + -1x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1x = 0 + -7 -1x = 0 + -7 Combine like terms: 0 + -7 = -7 -1x = -7 Divide each side by '-1'. x = 7 Simplifying x = 7Solution
x = {-12, 7}
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