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x in (-oo:+oo)
(8/5)*x-2.8 = (1/4)*x-4 // - (1/4)*x-4
(8/5)*x-((1/4)*x)-2.8+4 = 0
(8/5)*x+(-1/4)*x-2.8+4 = 0
27/20*x+1.2 = 0 // - 1.2
27/20*x = -1.2 // : 27/20
x = -1.2/27/20
x = -0.88888889
x = -0.88888889
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