40=r-(12+10+7.5)

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Solution for 40=r-(12+10+7.5) equation: 



40=r-(12+10+7.5)

We move all terms to the left:

40-(r-(12+10+7.5))=0

We add all the numbers together, and all the variables

-(r-(29.5))+40=0



We calculate terms in parentheses: -(r-(29.5)), so:

r-(29.5)

We add all the numbers together, and all the variables

r-29.5

Back to the equation:

-(r-29.5)



We get rid of parentheses

-r+29.5+40=0

We add all the numbers together, and all the variables

-1r+69.5=0

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

-r=-69.5

r=-69.5/-1

r=69+0.5/1

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