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r/9+2(r/18+4)=10
We move all terms to the left:
r/9+2(r/18+4)-(10)=0
We multiply parentheses
r/9+2r+8-10=0
We multiply all the terms by the denominator
r+2r*9+8*9-10*9=0
We add all the numbers together, and all the variables
r+2r*9-18=0
Wy multiply elements
r+18r-18=0
We add all the numbers together, and all the variables
19r-18=0
We move all terms containing r to the left, all other terms to the right
19r=18
r=18/19
r=18/19
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