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250a=20a-50
We move all terms to the left:
250a-(20a-50)=0
We get rid of parentheses
250a-20a+50=0
We add all the numbers together, and all the variables
230a+50=0
We move all terms containing a to the left, all other terms to the right
230a=-50
a=-50/230
a=-5/23
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