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2.5(x+7.5)=20
We move all terms to the left:
2.5(x+7.5)-(20)=0
We multiply parentheses
2.5x+18.75-20=0
We add all the numbers together, and all the variables
2.5x-1.25=0
We move all terms containing x to the left, all other terms to the right
2.5x=1.25
x=1.25/2.5
x=1/2
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