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4(6+x)=40
We move all terms to the left:
4(6+x)-(40)=0
We add all the numbers together, and all the variables
4(x+6)-40=0
We multiply parentheses
4x+24-40=0
We add all the numbers together, and all the variables
4x-16=0
We move all terms containing x to the left, all other terms to the right
4x=16
x=16/4
x=4
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