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-9+2(4-c)=-91
We move all terms to the left:
-9+2(4-c)-(-91)=0
We add all the numbers together, and all the variables
2(-1c+4)-9-(-91)=0
We add all the numbers together, and all the variables
2(-1c+4)+82=0
We multiply parentheses
-2c+8+82=0
We add all the numbers together, and all the variables
-2c+90=0
We move all terms containing c to the left, all other terms to the right
-2c=-90
c=-90/-2
c=+45
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