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0.5a-4=2.a
We move all terms to the left:
0.5a-4-(2.a)=0
We add all the numbers together, and all the variables
0.5a-(+2.a)-4=0
We get rid of parentheses
0.5a-2.a-4=0
We add all the numbers together, and all the variables
-1.5a-4=0
We move all terms containing a to the left, all other terms to the right
-1.5a=4
a=4/-1.5
a=-2+1/1.5
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