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77*77+b=85*85
We simplify the equation to the form, which is simple to understand
77*77+b=85*85
We move all terms containing b to the left and all other terms to the right.
+1b=+7225-5929
We simplify left and right side of the equation.
+1b=+1296
We divide both sides of the equation by 1 to get b.
b=1296
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