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x in (-oo:+oo)
-6 = x/7-3 // - x/7-3
3-(x/7)-6 = 0
-1/7*x-3 = 0 // + 3
-1/7*x = 3 // : -1/7
x = 3/(-1/7)
x = -21
x = -21
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