10r+5r+7r-20=12

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Solution for 10r+5r+7r-20=12 equation: 



10r+5r+7r-20=12

We move all terms to the left:

10r+5r+7r-20-(12)=0

We add all the numbers together, and all the variables

22r-32=0

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

22r=32

r=32/22

r=1+5/11

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