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6n+7(3n+2)=149
We move all terms to the left:
6n+7(3n+2)-(149)=0
We multiply parentheses
6n+21n+14-149=0
We add all the numbers together, and all the variables
27n-135=0
We move all terms containing n to the left, all other terms to the right
27n=135
n=135/27
n=5
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