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x in (-oo:+oo)
(4/5)*x-(2*x)-4 = (3/5)*(x+4) // - (3/5)*(x+4)
(4/5)*x-((3/5)*(x+4))-(2*x)-4 = 0
(-3/5)*(x+4)+(4/5)*x-2*x-4 = 0
(4*x)/5-3/5*(x+4)-2*x-4 = 0
(-3/5*5*(x+4))/5+(4*x)/5+(-2*5*x)/5+(-4*5)/5 = 0
4*x-3/5*5*(x+4)-2*5*x-4*5 = 0
x-10*x-20-12 = 0
-9*x-20-12 = 0
-9*x-32 = 0
(-9*x-32)/5 = 0
(-9*x-32)/5 = 0 // * 5
-9*x-32 = 0
-9*x-32 = 0 // + 32
-9*x = 32 // : -9
x = 32/(-9)
x = -32/9
x = -32/9
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