5r+7r=144

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Solution for 5r+7r=144 equation: 



5r+7r=144

We move all terms to the left:

5r+7r-(144)=0

We add all the numbers together, and all the variables

12r-144=0

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

12r=144

r=144/12

r=12

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