-2(3+8r)=90

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Solution for -2(3+8r)=90 equation: 



-2(3+8r)=90

We move all terms to the left:

-2(3+8r)-(90)=0

We add all the numbers together, and all the variables

-2(8r+3)-90=0

We multiply parentheses

-16r-6-90=0

We add all the numbers together, and all the variables

-16r-96=0

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

-16r=96

r=96/-16

r=-6

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