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