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6x-7(7x-10)=231
We move all terms to the left:
6x-7(7x-10)-(231)=0
We multiply parentheses
6x-49x+70-231=0
We add all the numbers together, and all the variables
-43x-161=0
We move all terms containing x to the left, all other terms to the right
-43x=161
x=161/-43
x=-3+32/43
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