2r+7=42r+15

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Solution for 2r+7=42r+15 equation: 



2r+7=42r+15

We move all terms to the left:

2r+7-(42r+15)=0

We get rid of parentheses

2r-42r-15+7=0

We add all the numbers together, and all the variables

-40r-8=0

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

-40r=8

r=8/-40

r=-1/5

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