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Simplifying (7m + 9n)(7m + -9n) = 0 Multiply (7m + 9n) * (7m + -9n) (7m * (7m + -9n) + 9n * (7m + -9n)) = 0 ((7m * 7m + -9n * 7m) + 9n * (7m + -9n)) = 0 Reorder the terms: ((-63mn + 49m2) + 9n * (7m + -9n)) = 0 ((-63mn + 49m2) + 9n * (7m + -9n)) = 0 (-63mn + 49m2 + (7m * 9n + -9n * 9n)) = 0 (-63mn + 49m2 + (63mn + -81n2)) = 0 Reorder the terms: (-63mn + 63mn + 49m2 + -81n2) = 0 Combine like terms: -63mn + 63mn = 0 (0 + 49m2 + -81n2) = 0 (49m2 + -81n2) = 0 Solving 49m2 + -81n2 = 0 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '81n2' to each side of the equation. 49m2 + -81n2 + 81n2 = 0 + 81n2 Combine like terms: -81n2 + 81n2 = 0 49m2 + 0 = 0 + 81n2 49m2 = 0 + 81n2 Remove the zero: 49m2 = 81n2 Divide each side by '49'. m2 = 1.653061224n2 Simplifying m2 = 1.653061224n2 Take the square root of each side: m = {-1.285714286n, 1.285714286n}
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