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4(1-r)+3r=-2(r+1)
We move all terms to the left:
4(1-r)+3r-(-2(r+1))=0
We add all the numbers together, and all the variables
4(-1r+1)+3r-(-2(r+1))=0
We add all the numbers together, and all the variables
3r+4(-1r+1)-(-2(r+1))=0
We multiply parentheses
3r-4r-(-2(r+1))+4=0
We calculate terms in parentheses: -(-2(r+1)), so:We add all the numbers together, and all the variables
-2(r+1)
We multiply parentheses
-2r-2
Back to the equation:
-(-2r-2)
-1r-(-2r-2)+4=0
We get rid of parentheses
-1r+2r+2+4=0
We add all the numbers together, and all the variables
r+6=0
We move all terms containing r to the left, all other terms to the right
r=-6
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