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x in (-oo:+oo)
(360-(2*x))/2 = 50 // - 50
(360-(2*x))/2-50 = 0
(360-2*x)/2-50 = 0
(360-2*x)/2+(-50*2)/2 = 0
360-2*x-50*2 = 0
260-2*x = 0
(260-2*x)/2 = 0
(260-2*x)/2 = 0 // * 2
260-2*x = 0
260-2*x = 0 // - 260
-2*x = -260 // : -2
x = -260/(-2)
x = 130
x = 130
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