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x in (-oo:+oo)
(1/2)*(360-x)-x = 120 // - 120
(1/2)*(360-x)-x-120 = 0
1/2*(360-x)-x-120 = 0
1/2*(360-x)-x-120 = 0
180-3/2*x-120 = 0
60-3/2*x = 0
60-3/2*x = 0
60-3/2*x = 0 // - 60
-3/2*x = -60 // : -3/2
x = -60/(-3/2)
x = 40
x = 40
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