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2(4+x)=40
We move all terms to the left:
2(4+x)-(40)=0
We add all the numbers together, and all the variables
2(x+4)-40=0
We multiply parentheses
2x+8-40=0
We add all the numbers together, and all the variables
2x-32=0
We move all terms containing x to the left, all other terms to the right
2x=32
x=32/2
x=16
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