15-5r=7-4r

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Solution for 15-5r=7-4r equation: 



15-5r=7-4r

We move all terms to the left:

15-5r-(7-4r)=0

We add all the numbers together, and all the variables

-5r-(-4r+7)+15=0

We get rid of parentheses

-5r+4r-7+15=0

We add all the numbers together, and all the variables

-1r+8=0

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

-r=-8

r=-8/-1

r=+8

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