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-2x = 6/15 + 5/15
-2x = 11/15
x = 11/15 di bagi -2
x = 11/15 di kali 1/-2
x = 11/-10
x = -1,1
7x - 9x = 2/5 + 1/3
-2x = (6+5)/15
-2x = 11/15
x = 11/15 : (-2)
x = 11/15 x (- 1/2)
x = - 11/30