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5(2x+4)=8x+40
We move all terms to the left:
5(2x+4)-(8x+40)=0
We multiply parentheses
10x-(8x+40)+20=0
We get rid of parentheses
10x-8x-40+20=0
We add all the numbers together, and all the variables
2x-20=0
We move all terms containing x to the left, all other terms to the right
2x=20
x=20/2
x=10
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