6r+4+7r-5=90

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Solution for 6r+4+7r-5=90 equation: 



6r+4+7r-5=90

We move all terms to the left:

6r+4+7r-5-(90)=0

We add all the numbers together, and all the variables

13r-91=0

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

13r=91

r=91/13

r=7

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