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4.5a+(-5.4a)=
We move all terms to the left:
4.5a+(-5.4a)-()=0
We add all the numbers together, and all the variables
4.5a+(-5.4a)=0
We get rid of parentheses
4.5a-5.4a=0
We add all the numbers together, and all the variables
-0.9a=0
a=0/-0.9
a=0
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