2(r-42)=84

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Solution for 2(r-42)=84 equation: 



2(r-42)=84

We move all terms to the left:

2(r-42)-(84)=0

We multiply parentheses

2r-84-84=0

We add all the numbers together, and all the variables

2r-168=0

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

2r=168

r=168/2

r=84

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