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x in (-oo:+oo)
X+(1/2)*x+x+15 = 180 // - 180
X+(1/2)*x+x-180+15 = 0
X+3/2*x-165 = 0 // - X-165
3/2*x = -(X-165) // : 3/2
x = (-(X-165))/3/2
x = 2/3*(165-X)
x = 2/3*(165-X)
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