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x in (-oo:+oo)
0*2 = (4/5)*x+4 // - (4/5)*x+4
0*2-((4/5)*x)-4 = 0
(-4/5)*x-4 = 0
-4/5*x-4 = 0 // + 4
-4/5*x = 4 // : -4/5
x = 4/(-4/5)
x = -5
x = -5
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