-10+r=10-r

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Solution for -10+r=10-r equation: 



-10+r=10-r

We move all terms to the left:

-10+r-(10-r)=0

We add all the numbers together, and all the variables

r-(-1r+10)-10=0

We get rid of parentheses

r+1r-10-10=0

We add all the numbers together, and all the variables

2r-20=0

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

2r=20

r=20/2

r=10

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