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1.5a+7.2=0.9a-1.6
We move all terms to the left:
1.5a+7.2-(0.9a-1.6)=0
We get rid of parentheses
1.5a-0.9a+1.6+7.2=0
We add all the numbers together, and all the variables
0.6a+8.8=0
We move all terms containing a to the left, all other terms to the right
0.6a=-8.8
a=-8.8/0.6
a=-14+0.4/0.6
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