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Simplifying
7c2 = 91
Solving
7c2 = 91
Solving for variable 'c'.
Move all terms containing c to the left, all other terms to the right.
Divide each side by '7'.
c2 = 13
Simplifying
c2 = 13
Take the square root of each side:
c = {-3.605551275, 3.605551275}
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