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x in (-oo:+oo)
(-3/7)*x = (2/2)/7 // - (2/2)/7
(-3/7)*x-((2/2)/7) = 0
(-3/7)*x-1/7 = 0
-3/7*x-1/7 = 0 // + 1/7
-3/7*x = 1/7 // : -3/7
x = 1/7/(-3/7)
x = -1/3
x = -1/3
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