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x in (-oo:+oo)
x+3/8 = (4/5)*x+19/40 // - (4/5)*x+19/40
x-((4/5)*x)+3/8-(19/40) = 0
x+(-4/5)*x+3/8-19/40 = 0
1/5*x-1/10 = 0 // + 1/10
1/5*x = 1/10 // : 1/5
x = 1/10/1/5
x = 1/2
x = 1/2
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