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-3.4-3.9=-12.4p
We move all terms to the left:
-3.4-3.9-(-12.4p)=0
We add all the numbers together, and all the variables
-(-12.4p)-7.3=0
We get rid of parentheses
12.4p-7.3=0
We move all terms containing p to the left, all other terms to the right
12.4p=7.3
p=7.3/12.4
p=5.6153846153846/9.5384615384615
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