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Simplifying
16r2 + -169 = 0
Reorder the terms:
-169 + 16r2 = 0
Solving
-169 + 16r2 = 0
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '169' to each side of the equation.
-169 + 169 + 16r2 = 0 + 169
Combine like terms: -169 + 169 = 0
0 + 16r2 = 0 + 169
16r2 = 0 + 169
Combine like terms: 0 + 169 = 169
16r2 = 169
Divide each side by '16'.
r2 = 10.5625
Simplifying
r2 = 10.5625
Take the square root of each side:
r = {-3.25, 3.25}
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