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x in (-oo:+oo)
(-4/5)*x = 12/35 // - 12/35
(-4/5)*x-(12/35) = 0
(-4/5)*x-12/35 = 0
-4/5*x-12/35 = 0 // + 12/35
-4/5*x = 12/35 // : -4/5
x = 12/35/(-4/5)
x = -3/7
x = -3/7
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