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x in (-oo:+oo)
(-3/7)*x = -7/3 // + -7/3
(-3/7)*x-(-7/3) = 0
(-3/7)*x+7/3 = 0
7/3-3/7*x = 0 // - 7/3
-3/7*x = -7/3 // : -3/7
x = -7/3/(-3/7)
x = 49/9
x = 49/9
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