80=42r-70+18r

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Solution for 80=42r-70+18r equation: 



80=42r-70+18r

We move all terms to the left:

80-(42r-70+18r)=0

We add all the numbers together, and all the variables

-(60r-70)+80=0

We get rid of parentheses

-60r+70+80=0

We add all the numbers together, and all the variables

-60r+150=0

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

-60r=-150

r=-150/-60

r=2+1/2

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