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x in (-oo:+oo)
x/(-7) = 6-3 // - 6-3
x/(-7)-6+3 = 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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