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(5r+2)7-6r=189
We move all terms to the left:
(5r+2)7-6r-(189)=0
We add all the numbers together, and all the variables
-6r+(5r+2)7-189=0
We multiply parentheses
-6r+35r+14-189=0
We add all the numbers together, and all the variables
29r-175=0
We move all terms containing r to the left, all other terms to the right
29r=175
r=175/29
r=6+1/29
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