-4=-1+r/2

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Solution for -4=-1+r/2 equation: 



-4=-1+r/2

We move all terms to the left:

-4-(-1+r/2)=0

We add all the numbers together, and all the variables

-(r/2-1)-4=0

We get rid of parentheses

-r/2+1-4=0

We multiply all the terms by the denominator


-r+1*2-4*2=0

We add all the numbers together, and all the variables

-1r-6=0

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

-r=6

r=6/-1

r=-6

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