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Simplifying k = (13 + -2x)(10 + -2x) * x Reorder the terms for easier multiplication: k = x(13 + -2x)(10 + -2x) Multiply (13 + -2x) * (10 + -2x) k = x(13(10 + -2x) + -2x * (10 + -2x)) k = x((10 * 13 + -2x * 13) + -2x * (10 + -2x)) k = x((130 + -26x) + -2x * (10 + -2x)) k = x(130 + -26x + (10 * -2x + -2x * -2x)) k = x(130 + -26x + (-20x + 4x2)) Combine like terms: -26x + -20x = -46x k = x(130 + -46x + 4x2) k = (130 * x + -46x * x + 4x2 * x) k = (130x + -46x2 + 4x3) Solving k = 130x + -46x2 + 4x3 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Simplifying k = 130x + -46x2 + 4x3
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