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x in (-oo:+oo)
(-1/4)*x = 21/4 // - 21/4
(-1/4)*x-(21/4) = 0
(-1/4)*x-21/4 = 0
-1/4*x-21/4 = 0 // + 21/4
-1/4*x = 21/4 // : -1/4
x = 21/4/(-1/4)
x = -21
x = -21
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