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x in (-oo:+oo)
X+(2/5)*x+(3/5)*x+x+30 = 360 // - 360
X+(2/5)*x+(3/5)*x+x-360+30 = 0
X+2*x-330 = 0 // - X-330
2*x = -(X-330) // : 2
x = (-(X-330))/2
x = (330-X)/2
x = (330-X)/2
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