x + 9 = 17
x = 17 - 9
x = 8
y - 17 = 60
y = 60 + 17
y = 77
90 - z = 79
-x = 79 - 90
-x = -11 / · (-1)
x = 11
6a = -18 / : 6
a = -3
k : 4 = 12 / · 4
k = 48
36 : u = 9 / · u
36 = 9u / : 9
u = 4
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x + 9 = 17
x = 17 - 9
x = 8
y - 17 = 60
y = 60 + 17
y = 77
90 - z = 79
-x = 79 - 90
-x = -11 / · (-1)
x = 11
6a = -18 / : 6
a = -3
k : 4 = 12 / · 4
k = 48
36 : u = 9 / · u
36 = 9u / : 9
u = 4