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x in (-oo:+oo)
(-2/3)*x = 21/54 // - 21/54
(-2/3)*x-(21/54) = 0
(-2/3)*x-7/18 = 0
-2/3*x-7/18 = 0 // + 7/18
-2/3*x = 7/18 // : -2/3
x = 7/18/(-2/3)
x = -7/12
x = -7/12
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