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