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u/3-15 = 0.2*x-5 // - 0.2*x-5
u/3-(0.2*x)-15+5 = 0
u/3-0.2*x-15+5 = 0
1/3*u-0.2*x-10 = 0 // - 1/3*u-10
-0.2*x = -(1/3*u-10) // : -0.2
x = (-(1/3*u-10))/(-0.2)
x = -5*(10-(1/3*u))
x = -5*(10-(1/3*u))
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