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4(1+x)=40
We move all terms to the left:
4(1+x)-(40)=0
We add all the numbers together, and all the variables
4(x+1)-40=0
We multiply parentheses
4x+4-40=0
We add all the numbers together, and all the variables
4x-36=0
We move all terms containing x to the left, all other terms to the right
4x=36
x=36/4
x=9
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