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Simplifying 8x(x + -9) + (7 + -1x) * 8x = 64 Reorder the terms: 8x(-9 + x) + (7 + -1x) * 8x = 64 (-9 * 8x + x * 8x) + (7 + -1x) * 8x = 64 (-72x + 8x^{2}) + (7 + -1x) * 8x = 64 Reorder the terms for easier multiplication: -72x + 8x^{2}+ 8x(7 + -1x) = 64 -72x + 8x^{2}+ (7 * 8x + -1x * 8x) = 64 -72x + 8x^{2}+ (56x + -8x^{2}) = 64 Reorder the terms: -72x + 56x + 8x^{2}+ -8x^{2}= 64 Combine like terms: -72x + 56x = -16x -16x + 8x^{2}+ -8x^{2}= 64 Combine like terms: 8x^{2}+ -8x^{2}= 0 -16x + 0 = 64 -16x = 64 Solving -16x = 64 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '-16'. x = -4 Simplifying x = -4

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