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-8=-10+a/10
We move all terms to the left:
-8-(-10+a/10)=0
We add all the numbers together, and all the variables
-(a/10-10)-8=0
We get rid of parentheses
-a/10+10-8=0
We multiply all the terms by the denominator
-a+10*10-8*10=0
We add all the numbers together, and all the variables
-1a+20=0
We move all terms containing a to the left, all other terms to the right
-a=-20
a=-20/-1
a=+20
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