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90=94-c
We move all terms to the left:
90-(94-c)=0
We add all the numbers together, and all the variables
-(-1c+94)+90=0
We get rid of parentheses
1c-94+90=0
We add all the numbers together, and all the variables
c-4=0
We move all terms containing c to the left, all other terms to the right
c=4
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