a - 6 a =
7 y - 2 y + y =
13 x + y - 18 - 7 y =
15 a - 6 - 2 a + 8 =
a-6a= -5a
7y-2y+y=6y
13x+y-18-7y=13x-6y-18
15a-6-2a+8=13a+2
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a-6a= -5a
7y-2y+y=6y
13x+y-18-7y=13x-6y-18
15a-6-2a+8=13a+2
a-6a= -5a
7y-2y+y=6y
13x+y-18-7y=13x-6y-18
15a-6-2a+8=13a+2