75=30+r

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Solution for 75=30+r equation: 



75=30+r

We move all terms to the left:

75-(30+r)=0

We add all the numbers together, and all the variables

-(r+30)+75=0

We get rid of parentheses

-r-30+75=0

We add all the numbers together, and all the variables

-1r+45=0

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

-r=-45

r=-45/-1

r=+45

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