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5(4+2x)=40
We move all terms to the left:
5(4+2x)-(40)=0
We add all the numbers together, and all the variables
5(2x+4)-40=0
We multiply parentheses
10x+20-40=0
We add all the numbers together, and all the variables
10x-20=0
We move all terms containing x to the left, all other terms to the right
10x=20
x=20/10
x=2
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