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-12=-10+a/4
We move all terms to the left:
-12-(-10+a/4)=0
We add all the numbers together, and all the variables
-(a/4-10)-12=0
We get rid of parentheses
-a/4+10-12=0
We multiply all the terms by the denominator
-a+10*4-12*4=0
We add all the numbers together, and all the variables
-1a-8=0
We move all terms containing a to the left, all other terms to the right
-a=8
a=8/-1
a=-8
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