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4(10-7x)=40
We move all terms to the left:
4(10-7x)-(40)=0
We add all the numbers together, and all the variables
4(-7x+10)-40=0
We multiply parentheses
-28x+40-40=0
We add all the numbers together, and all the variables
-28x=0
x=0/-28
x=0
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