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x in (-oo:+oo)
(-2/3)*x+8 = (4/5)*x+4 // - (4/5)*x+4
(-2/3)*x-((4/5)*x)-4+8 = 0
(-2/3)*x+(-4/5)*x-4+8 = 0
4-22/15*x = 0 // - 4
-22/15*x = -4 // : -22/15
x = -4/(-22/15)
x = 30/11
x = 30/11
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