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x in (-oo:+oo)
(-2/7)*x = -16/7 // + -16/7
(-2/7)*x-(-16/7) = 0
(-2/7)*x+16/7 = 0
16/7-2/7*x = 0 // - 16/7
-2/7*x = -16/7 // : -2/7
x = -16/7/(-2/7)
x = 8
x = 8
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