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-1.5=a-1.8
We move all terms to the left:
-1.5-(a-1.8)=0
We get rid of parentheses
-a+1.8-1.5=0
We add all the numbers together, and all the variables
-1a+0.3=0
We move all terms containing a to the left, all other terms to the right
-a=-0.3
a=-0.3/-1
a=0.3/1
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