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Simplifying 0 = 72x + -18x2 Solving 0 = 72x + -18x2 Solving for variable 'x'. Remove the zero: -72x + 18x2 = 72x + -18x2 + -72x + 18x2 Reorder the terms: -72x + 18x2 = 72x + -72x + -18x2 + 18x2 Combine like terms: 72x + -72x = 0 -72x + 18x2 = 0 + -18x2 + 18x2 -72x + 18x2 = -18x2 + 18x2 Combine like terms: -18x2 + 18x2 = 0 -72x + 18x2 = 0 Factor out the Greatest Common Factor (GCF), '18x'. 18x(-4 + x) = 0 Ignore the factor 18.Subproblem 1
Set the factor 'x' equal to zero and attempt to solve: Simplifying x = 0 Solving x = 0 Move all terms containing x to the left, all other terms to the right. Simplifying x = 0Subproblem 2
Set the factor '(-4 + x)' equal to zero and attempt to solve: Simplifying -4 + x = 0 Solving -4 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 0 + 4 Combine like terms: -4 + 4 = 0 0 + x = 0 + 4 x = 0 + 4 Combine like terms: 0 + 4 = 4 x = 4 Simplifying x = 4Solution
x = {0, 4}
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