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x in (-oo:+oo)
(-4/7)*x = 16/27 // - 16/27
(-4/7)*x-(16/27) = 0
(-4/7)*x-16/27 = 0
-4/7*x-16/27 = 0 // + 16/27
-4/7*x = 16/27 // : -4/7
x = 16/27/(-4/7)
x = -28/27
x = -28/27
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