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3.5(2x-5)=20
We move all terms to the left:
3.5(2x-5)-(20)=0
We multiply parentheses
7x-17.5-20=0
We add all the numbers together, and all the variables
7x-37.5=0
We move all terms containing x to the left, all other terms to the right
7x=37.5
x=37.5/7
x=5+2.5/7
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