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4(3-x)=40
We move all terms to the left:
4(3-x)-(40)=0
We add all the numbers together, and all the variables
4(-1x+3)-40=0
We multiply parentheses
-4x+12-40=0
We add all the numbers together, and all the variables
-4x-28=0
We move all terms containing x to the left, all other terms to the right
-4x=28
x=28/-4
x=-7
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