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x in (-oo:+oo)
X+(5/2)*x = 420 // - 420
X+(5/2)*x-420 = 0
X+5/2*x-420 = 0 // - X-420
5/2*x = -(X-420) // : 5/2
x = (-(X-420))/5/2
x = 2/5*(420-X)
x = 2/5*(420-X)
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