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x in (-oo:+oo)
2 = (3/7)*x // - (3/7)*x
2-((3/7)*x) = 0
(-3/7)*x+2 = 0
2-3/7*x = 0 // - 2
-3/7*x = -2 // : -3/7
x = -2/(-3/7)
x = 14/3
x = 14/3
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