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x in (-oo:+oo)
(3*x)/2+3*x = 180 // - 180
(3*x)/2+3*x-180 = 0
9/2*x-180 = 0 // + 180
9/2*x = 180 // : 9/2
x = 180/9/2
x = 40
x = 40
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