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4(x+2)+2(3x+1)=40
We move all terms to the left:
4(x+2)+2(3x+1)-(40)=0
We multiply parentheses
4x+6x+8+2-40=0
We add all the numbers together, and all the variables
10x-30=0
We move all terms containing x to the left, all other terms to the right
10x=30
x=30/10
x=3
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