4-9r=12

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Solution for 4-9r=12 equation: 



4-9r=12

We move all terms to the left:

4-9r-(12)=0

We add all the numbers together, and all the variables

-9r-8=0

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

-9r=8

r=8/-9

r=-8/9

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