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6x-7=138x+56
We move all terms to the left:
6x-7-(138x+56)=0
We get rid of parentheses
6x-138x-56-7=0
We add all the numbers together, and all the variables
-132x-63=0
We move all terms containing x to the left, all other terms to the right
-132x=63
x=63/-132
x=-21/44
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