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x in (-oo:+oo)
(((7/15)*x)/(-1))/5 = 4 // - 4
(((7/15)*x)/(-1))/5-4 = 0
((-7/15)*x)/5-4 = 0
-7/75*x-4 = 0 // + 4
-7/75*x = 4 // : -7/75
x = 4/(-7/75)
x = -300/7
x = -300/7
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