-3+21-2c=0
-2c=-18
2c=18
c=18/2
c=9
(-3) - 7(-3) -2c=0
-3 + 21 - 2c=0
-2c=3- 21
-2c= -18
c=+ 9 *****
ta nois
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-3+21-2c=0
-2c=-18
2c=18
c=18/2
c=9
(-3) - 7(-3) -2c=0
-3 + 21 - 2c=0
-2c=3- 21
-2c= -18
c=+ 9 *****
ta nois