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1505=20x+225
We move all terms to the left:
1505-(20x+225)=0
We get rid of parentheses
-20x-225+1505=0
We add all the numbers together, and all the variables
-20x+1280=0
We move all terms containing x to the left, all other terms to the right
-20x=-1280
x=-1280/-20
x=+64
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