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-3c^2(c+11)-(4c-5)(3c-2)=0
We multiply parentheses ..
-3c^2(c+11)-(+12c^2-8c-15c+10)=0
We get rid of parentheses
-3c^2(c+11)-12c^2+8c+15c-10=0
We add all the numbers together, and all the variables
-12c^2-3c^2(c+11)+23c-10=0
We move all terms containing c to the left, all other terms to the right
-12c^2-3c^2(c+11)+23c=10
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