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