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x in (-oo:+oo)
-4/5 = (5/3)*x-(3/7) // - (5/3)*x-(3/7)
3/7-((5/3)*x)-4/5 = 0
(-5/3)*x-4/5+3/7 = 0
-5/3*x-13/35 = 0 // + 13/35
-5/3*x = 13/35 // : -5/3
x = 13/35/(-5/3)
x = -39/175
x = -39/175
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