r-3=30+90

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Solution for r-3=30+90 equation: 



r-3=30+90

We move all terms to the left:

r-3-(30+90)=0

We add all the numbers together, and all the variables

r-3-120=0

We add all the numbers together, and all the variables

r-123=0

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

r=123

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