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+3=4C-13=90
We move all terms to the left:
+3-(4C-13)=0
We get rid of parentheses
-4C+13+3=0
We add all the numbers together, and all the variables
-4C+16=0
We move all terms containing C to the left, all other terms to the right
-4C=-16
C=-16/-4
C=+4
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