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x in (-oo:+oo)
(-3/7)*x+9 = 6 // - 6
(-3/7)*x-6+9 = 0
3-3/7*x = 0 // - 3
-3/7*x = -3 // : -3/7
x = -3/(-3/7)
x = 7
x = 7
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