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7r+3(7r+2)=-162
We move all terms to the left:
7r+3(7r+2)-(-162)=0
We add all the numbers together, and all the variables
7r+3(7r+2)+162=0
We multiply parentheses
7r+21r+6+162=0
We add all the numbers together, and all the variables
28r+168=0
We move all terms containing r to the left, all other terms to the right
28r=-168
r=-168/28
r=-6
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