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x in (-oo:+oo)
(2/3)*x+15 = 1*u // - 1*u
(2/3)*x-(1*u)+15 = 0
(2/3)*x-u+15 = 0
2/3*x-u+15 = 0 // - 15-u
2/3*x = -(15-u) // : 2/3
x = (-(15-u))/2/3
x = 3/2*(u-15)
x = 3/2*(u-15)
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