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-4+3(1-4r)=-49
We move all terms to the left:
-4+3(1-4r)-(-49)=0
We add all the numbers together, and all the variables
3(-4r+1)-4-(-49)=0
We add all the numbers together, and all the variables
3(-4r+1)+45=0
We multiply parentheses
-12r+3+45=0
We add all the numbers together, and all the variables
-12r+48=0
We move all terms containing r to the left, all other terms to the right
-12r=-48
r=-48/-12
r=+4
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