20^2-12r-144=0

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Solution for 20^2-12r-144=0 equation: 



20^2-12r-144=0

We add all the numbers together, and all the variables

-12r+256=0

We move all terms containing r to the left, all other terms to the right

-12r=-256

r=-256/-12

r=21+1/3

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