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x in (-oo:+oo)
X/3-(x/5) = x+13 // - x+13
X/3-(x/5)-x-13 = 0
1/3*X-6/5*x-13 = 0 // - 1/3*X-13
-6/5*x = -(1/3*X-13) // : -6/5
x = (-(1/3*X-13))/(-6/5)
x = -5/6*(13-(1/3*X))
x = -5/6*(13-(1/3*X))
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