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x in (-oo:+oo)
X+(1/2)*x-9 = 180 // - 180
X+(1/2)*x-180-9 = 0
X+1/2*x-189 = 0 // - X-189
1/2*x = -(X-189) // : 1/2
x = (-(X-189))/1/2
x = 2*(189-X)
x = 2*(189-X)
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