3r+45=12r

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Solution for 3r+45=12r equation: 



3r+45=12r

We move all terms to the left:

3r+45-(12r)=0

We add all the numbers together, and all the variables

-9r+45=0

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

-9r=-45

r=-45/-9

r=+5

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