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2.5(2x-4)=90
We move all terms to the left:
2.5(2x-4)-(90)=0
We multiply parentheses
5x-10-90=0
We add all the numbers together, and all the variables
5x-100=0
We move all terms containing x to the left, all other terms to the right
5x=100
x=100/5
x=20
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