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x in (-oo:+oo)
(-3/7)*x = 4 // - 4
(-3/7)*x-4 = 0
-3/7*x-4 = 0 // + 4
-3/7*x = 4 // : -3/7
x = 4/(-3/7)
x = -28/3
x = -28/3
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