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50=a*10
We move all terms to the left:
50-(a*10)=0
We add all the numbers together, and all the variables
-(+a*10)+50=0
We get rid of parentheses
-a*10+50=0
Wy multiply elements
-10a+50=0
We move all terms containing a to the left, all other terms to the right
-10a=-50
a=-50/-10
a=+5
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