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-6(1+2r)-10(r-9)=-26
We move all terms to the left:
-6(1+2r)-10(r-9)-(-26)=0
We add all the numbers together, and all the variables
-6(2r+1)-10(r-9)-(-26)=0
We add all the numbers together, and all the variables
-6(2r+1)-10(r-9)+26=0
We multiply parentheses
-12r-10r-6+90+26=0
We add all the numbers together, and all the variables
-22r+110=0
We move all terms containing r to the left, all other terms to the right
-22r=-110
r=-110/-22
r=+5
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