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-a = 9 - 16
-a = -7
a = 7
12 : n =1/4 /*n
12 = 1/4n /*4
n = 48
a : 1 1/3 = 1/6
3/4a = 1/6 /*4/3
a = 1/6*4/3
a = 1/3*2/3
a = 2/9
a=16-9
a=7
/*n
12=/:
12*4=n
n=48
a:
a:=
a*/:
a=
a=
a=
:)