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x in (-oo:+oo)
(-3/7)*x = 49 // - 49
(-3/7)*x-49 = 0
-3/7*x-49 = 0 // + 49
-3/7*x = 49 // : -3/7
x = 49/(-3/7)
x = -343/3
x = -343/3
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