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x in (-oo:+oo)
(-7/18)*x = 28/18 // - 28/18
(-7/18)*x-(28/18) = 0
(-7/18)*x-14/9 = 0
-7/18*x-14/9 = 0 // + 14/9
-7/18*x = 14/9 // : -7/18
x = 14/9/(-7/18)
x = -4
x = -4
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