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x in (-oo:+oo)
(-4/7)*x = 16/14 // - 16/14
(-4/7)*x-(16/14) = 0
(-4/7)*x-8/7 = 0
-4/7*x-8/7 = 0 // + 8/7
-4/7*x = 8/7 // : -4/7
x = 8/7/(-4/7)
x = -2
x = -2
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