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10(4r+9)=65r-10+2-15r
We move all terms to the left:
10(4r+9)-(65r-10+2-15r)=0
We add all the numbers together, and all the variables
10(4r+9)-(50r-8)=0
We multiply parentheses
40r-(50r-8)+90=0
We get rid of parentheses
40r-50r+8+90=0
We add all the numbers together, and all the variables
-10r+98=0
We move all terms containing r to the left, all other terms to the right
-10r=-98
r=-98/-10
r=9+4/5
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