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Simplifying x(x + -5) + -1x(x + 4) = -63 Reorder the terms: x(-5 + x) + -1x(x + 4) = -63 (-5 * x + x * x) + -1x(x + 4) = -63 (-5x + x2) + -1x(x + 4) = -63 Reorder the terms: -5x + x2 + -1x(4 + x) = -63 -5x + x2 + (4 * -1x + x * -1x) = -63 -5x + x2 + (-4x + -1x2) = -63 Reorder the terms: -5x + -4x + x2 + -1x2 = -63 Combine like terms: -5x + -4x = -9x -9x + x2 + -1x2 = -63 Combine like terms: x2 + -1x2 = 0 -9x + 0 = -63 -9x = -63 Solving -9x = -63 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '-9'. x = 7 Simplifying x = 7
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