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x in (-oo:+oo)
(-2/5)*(x+0.8)+1/50 = 0
1/50-2/5*(x+0.8) = 0
(-2/5*50*(x+0.8))/50+1/50 = 0
1-2/5*50*(x+0.8) = 0
-20*x-15 = 0
(-20*x-15)/50 = 0
(-20*x-15)/50 = 0 // * 50
-20*x-15 = 0
-20*x-15 = 0 // + 15
-20*x = 15 // : -20
x = 15/(-20)
x = -3/4
x = -3/4
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