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