21r+100=46r-100

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Solution for 21r+100=46r-100 equation: 



21r+100=46r-100

We move all terms to the left:

21r+100-(46r-100)=0

We get rid of parentheses

21r-46r+100+100=0

We add all the numbers together, and all the variables

-25r+200=0

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

-25r=-200

r=-200/-25

r=+8

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