4(r-90)+4r=3400

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Solution for 4(r-90)+4r=3400 equation: 



4(r-90)+4r=3400

We move all terms to the left:

4(r-90)+4r-(3400)=0

We add all the numbers together, and all the variables

4r+4(r-90)-3400=0

We multiply parentheses

4r+4r-360-3400=0

We add all the numbers together, and all the variables

8r-3760=0

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

8r=3760

r=3760/8

r=470

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