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x in (-oo:+oo)
0.4*(x-8)-((1/5)*x) = 0.2*(x-16) // - 0.2*(x-16)
0.4*(x-8)-(0.2*(x-16))-((1/5)*x) = 0
0.4*(x-8)-0.2*(x-16)+(-1/5)*x = 0
0.4*(x-8)-0.2*(x-16)-x/5 = 0
(0.4*5*(x-8))/5+(-0.2*5*(x-16))/5-x/5 = 0
0.4*5*(x-8)-0.2*5*(x-16)-x = 0
x-x = 0
0 = 0
0/5 = 0
0/5 = 0 // * 5
0 = 0
0 = 0
x należy do R
x in (-oo:+oo)
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