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7-3c=-10c-7+9c
We move all terms to the left:
7-3c-(-10c-7+9c)=0
We add all the numbers together, and all the variables
-3c-(-1c-7)+7=0
We get rid of parentheses
-3c+1c+7+7=0
We add all the numbers together, and all the variables
-2c+14=0
We move all terms containing c to the left, all other terms to the right
-2c=-14
c=-14/-2
c=+7
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