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2.6+.9p=p+2.1
We move all terms to the left:
2.6+.9p-(p+2.1)=0
We get rid of parentheses
.9p-p-2.1+2.6=0
We add all the numbers together, and all the variables
-0.1p+0.5=0
We move all terms containing p to the left, all other terms to the right
-0.1p=-0.5
p=-0.5/-0.1
p=+5
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