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