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84*84+b=91*91
We simplify the equation to the form, which is simple to understand
84*84+b=91*91
We move all terms containing b to the left and all other terms to the right.
+1b=+8281-7056
We simplify left and right side of the equation.
+1b=+1225
We divide both sides of the equation by 1 to get b.
b=1225
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