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-7(6x-9)=-42x+63
We move all terms to the left:
-7(6x-9)-(-42x+63)=0
We multiply parentheses
-42x-(-42x+63)+63=0
We get rid of parentheses
-42x+42x-63+63=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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