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x in (-oo:+oo)
(2*x)/5+x/2 = 180 // - 180
(2*x)/5+x/2-180 = 0
9/10*x-180 = 0 // + 180
9/10*x = 180 // : 9/10
x = 180/9/10
x = 200
x = 200
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