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x in (-oo:+oo)
8*(x-(5/2)) = 3*x // - 3*x
8*(x-(5/2))-(3*x) = 0
8*(x-5/2)-3*x = 0
8*(x-5/2)-3*x = 0
5*x-20 = 0
5*x-20 = 0
5*x-20 = 0 // + 20
5*x = 20 // : 5
x = 20/5
x = 4
x = 4
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