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x in (-oo:+oo)
(-7/3)*x = 21/4 // - 21/4
(-7/3)*x-(21/4) = 0
(-7/3)*x-21/4 = 0
-7/3*x-21/4 = 0 // + 21/4
-7/3*x = 21/4 // : -7/3
x = 21/4/(-7/3)
x = -9/4
x = -9/4
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