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Simplifying 5x(x + -2) = 5x2 + 40 Reorder the terms: 5x(-2 + x) = 5x2 + 40 (-2 * 5x + x * 5x) = 5x2 + 40 (-10x + 5x2) = 5x2 + 40 Reorder the terms: -10x + 5x2 = 40 + 5x2 Add '-5x2' to each side of the equation. -10x + 5x2 + -5x2 = 40 + 5x2 + -5x2 Combine like terms: 5x2 + -5x2 = 0 -10x + 0 = 40 + 5x2 + -5x2 -10x = 40 + 5x2 + -5x2 Combine like terms: 5x2 + -5x2 = 0 -10x = 40 + 0 -10x = 40 Solving -10x = 40 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '-10'. x = -4 Simplifying x = -4
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