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x in (-oo:+oo)
(-2/7)*x+8 = 6 // - 6
(-2/7)*x-6+8 = 0
2-2/7*x = 0 // - 2
-2/7*x = -2 // : -2/7
x = -2/(-2/7)
x = 7
x = 7
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