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4(2+x)=40
We move all terms to the left:
4(2+x)-(40)=0
We add all the numbers together, and all the variables
4(x+2)-40=0
We multiply parentheses
4x+8-40=0
We add all the numbers together, and all the variables
4x-32=0
We move all terms containing x to the left, all other terms to the right
4x=32
x=32/4
x=8
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