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7x+3(6x+7)=246
We move all terms to the left:
7x+3(6x+7)-(246)=0
We multiply parentheses
7x+18x+21-246=0
We add all the numbers together, and all the variables
25x-225=0
We move all terms containing x to the left, all other terms to the right
25x=225
x=225/25
x=9
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