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3x=40-(4x)
We move all terms to the left:
3x-(40-(4x))=0
We add all the numbers together, and all the variables
3x-(-4x+40)=0
We get rid of parentheses
3x+4x-40=0
We add all the numbers together, and all the variables
7x-40=0
We move all terms containing x to the left, all other terms to the right
7x=40
x=40/7
x=5+5/7
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