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6c+90=25c-100
We move all terms to the left:
6c+90-(25c-100)=0
We get rid of parentheses
6c-25c+100+90=0
We add all the numbers together, and all the variables
-19c+190=0
We move all terms containing c to the left, all other terms to the right
-19c=-190
c=-190/-19
c=+10
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