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2.8-3.2a=-4.8-5.1a
We move all terms to the left:
2.8-3.2a-(-4.8-5.1a)=0
We add all the numbers together, and all the variables
-3.2a-(-5.1a-4.8)+2.8=0
We get rid of parentheses
-3.2a+5.1a+4.8+2.8=0
We add all the numbers together, and all the variables
1.9a+7.6=0
We move all terms containing a to the left, all other terms to the right
1.9a=-7.6
a=-7.6/1.9
a=-4
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