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