42=2(r-68)

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Solution for 42=2(r-68) equation: 



42=2(r-68)

We move all terms to the left:

42-(2(r-68))=0



We calculate terms in parentheses: -(2(r-68)), so:

2(r-68)

We multiply parentheses

2r-136

Back to the equation:

-(2r-136)



We get rid of parentheses

-2r+136+42=0

We add all the numbers together, and all the variables

-2r+178=0

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

-2r=-178

r=-178/-2

r=+89

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