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20(x+15)=75
We move all terms to the left:
20(x+15)-(75)=0
We multiply parentheses
20x+300-75=0
We add all the numbers together, and all the variables
20x+225=0
We move all terms containing x to the left, all other terms to the right
20x=-225
x=-225/20
x=-11+1/4
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