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x in (-oo:+oo)
(-21/2)*x = 7/3 // - 7/3
(-21/2)*x-(7/3) = 0
(-21/2)*x-7/3 = 0
-21/2*x-7/3 = 0 // + 7/3
-21/2*x = 7/3 // : -21/2
x = 7/3/(-21/2)
x = -2/9
x = -2/9
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