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12=9c+5c
We move all terms to the left:
12-(9c+5c)=0
We add all the numbers together, and all the variables
-(+14c)+12=0
We get rid of parentheses
-14c+12=0
We move all terms containing c to the left, all other terms to the right
-14c=-12
c=-12/-14
c=6/7
| 12=9c+5c | | 12=9c+5c | | X+x5=72 | | X+x5=72 | | X+x5=72 | | X+x5=72 | | -3=w/11 | | -3=w/11 | | -3=w/11 | | 197=132-w | | 197=132-w | | 197=132-w | | 38=5f−7 | | 1•a=2•-5 | | 38=5f−7 | | 1•a=2•-5 | | 38=5f−7 | | 38=5f−7 | | 1•a=2•-5 | | 38=5f−7 | | 1•a=2•-5 | | 1•a=2•-5 | | 1•a=2•-5 | | 1•a=2•-5 | | 1•a=2•-5 | | 38=5f−7 | | 38=5f−7 | | 3/4•d=18 | | 3/4•d=18 | | d•4/2=8 | | d•4/2=8 | | 2b+-4=-28 |