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a+0.3=2a-1.7-0.5a
We move all terms to the left:
a+0.3-(2a-1.7-0.5a)=0
We add all the numbers together, and all the variables
a-(1.5a-1.7)+0.3=0
We get rid of parentheses
a-1.5a+1.7+0.3=0
We add all the numbers together, and all the variables
-0.5a+2=0
We move all terms containing a to the left, all other terms to the right
-0.5a=-2
a=-2/-0.5
a=+4
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