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x in (-oo:+oo)
-3 = (-8/3)*x+(4/3)*x-8 // - (-8/3)*x+(4/3)*x-8
8-((-8/3)*x)-((4/3)*x)-3 = 0
(8/3)*x+(-4/3)*x-3+8 = 0
4/3*x+5 = 0 // - 5
4/3*x = -5 // : 4/3
x = -5/4/3
x = -15/4
x = -15/4
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