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72+1.5a=68+2a
We move all terms to the left:
72+1.5a-(68+2a)=0
We add all the numbers together, and all the variables
1.5a-(2a+68)+72=0
We get rid of parentheses
1.5a-2a-68+72=0
We add all the numbers together, and all the variables
-0.5a+4=0
We move all terms containing a to the left, all other terms to the right
-0.5a=-4
a=-4/-0.5
a=+8
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