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x in (-oo:+oo)
X-(8*(5/2)) = 3*x // - 3*x
X-(3*x)-(8*(5/2)) = 0
X-3*x-20 = 0
X-3*x-20 = 0 // - X-20
-3*x = -(X-20) // : -3
x = (-(X-20))/(-3)
x = (20-X)/(-3)
x = (20-X)/(-3)
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