(R-4)(5r-4)=0

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Solution for (R-4)(5r-4)=0 equation: 



(-4)(5R-4)=0

We multiply parentheses ..

(-20R+16)=0

We get rid of parentheses

-20R+16=0

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

-20R=-16

R=-16/-20

R=4/5

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