3r+12+(-8r)+210=90

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Solution for 3r+12+(-8r)+210=90 equation: 



3r+12+(-8r)+210=90

We move all terms to the left:

3r+12+(-8r)+210-(90)=0

We add all the numbers together, and all the variables

3r+(-8r)+132=0

We get rid of parentheses

3r-8r+132=0

We add all the numbers together, and all the variables

-5r+132=0

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

-5r=-132

r=-132/-5

r=26+2/5

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