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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