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x in (-oo:+oo)
X/3 = (4*x)/5 // - (4*x)/5
X/3-((4*x)/5) = 0
X/3+(-4/5)*x = 0
1/3*X-4/5*x = 0 // - 1/3*X
-4/5*x = -(1/3*X) // : -4/5
x = (-(1/3*X))/(-4/5)
x = 5/12*X
x = 5/12*X
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