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1.2+(-0.3a)=-3.6
We move all terms to the left:
1.2+(-0.3a)-(-3.6)=0
We add all the numbers together, and all the variables
(-0.3a)+4.8=0
We get rid of parentheses
-0.3a+4.8=0
We move all terms containing a to the left, all other terms to the right
-0.3a=-4.8
a=-4.8/-0.3
a=+16
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