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x in (-oo:+oo)
7 = (6/2)*x // - (6/2)*x
7-((6/2)*x) = 0
7-3*x = 0
7-3*x = 0 // - 7
-3*x = -7 // : -3
x = -7/(-3)
x = 7/3
x = 7/3
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