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x in (-oo:+oo)
(180*(x-2))/2 = 170 // - 170
(180*(x-2))/2-170 = 0
(180*(x-2))/2+(-170*2)/2 = 0
180*(x-2)-170*2 = 0
180*x-700 = 0
(180*x-700)/2 = 0
(180*x-700)/2 = 0 // * 2
180*x-700 = 0
180*x-700 = 0 // + 700
180*x = 700 // : 180
x = 700/180
x = 35/9
x = 35/9
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