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x in (-oo:+oo)
4/(-3)-7*x = 6 // - 6
4/(-3)-7*x-6 = 0
-7*x-22/3 = 0 // + 22/3
-7*x = 22/3 // : -7
x = 22/3/(-7)
x = -22/21
x = -22/21
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