what is 7-c=-13

what is 7-c=-13

The slow but safe way:

7 - c = -13     [subtract (-) 7 from both sides]

-c = -20         [multiply (*) both sides by -1]

c = 20

The fast way:

7 - c = -13    [Remember that (a - b) = -(b - a), by using this ruse we get rid of the minus signs at once]

c - 7 = 13

c = 20 

7 - c = -13

-c     = -13 + 7

-c     =  -6

-c/-1 = -6/-1

 c      = 6//

No sasini      

thje first line should be

-c=-13-7