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225=45x+20
We move all terms to the left:
225-(45x+20)=0
We get rid of parentheses
-45x-20+225=0
We add all the numbers together, and all the variables
-45x+205=0
We move all terms containing x to the left, all other terms to the right
-45x=-205
x=-205/-45
x=4+5/9
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