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0.5a-3=0.3(2a-3)
We move all terms to the left:
0.5a-3-(0.3(2a-3))=0
We calculate terms in parentheses: -(0.3(2a-3)), so:We get rid of parentheses
0.3(2a-3)
We multiply parentheses
0.6a-0.9
Back to the equation:
-(0.6a-0.9)
0.5a-0.6a+0.9-3=0
We add all the numbers together, and all the variables
-0.1a-2.1=0
We move all terms containing a to the left, all other terms to the right
-0.1a=2.1
a=2.1/-0.1
a=-21
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