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4x+4(2x-5)=40
We move all terms to the left:
4x+4(2x-5)-(40)=0
We multiply parentheses
4x+8x-20-40=0
We add all the numbers together, and all the variables
12x-60=0
We move all terms containing x to the left, all other terms to the right
12x=60
x=60/12
x=5
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