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x in (-oo:+oo)
(7/15)*x-(3/15) = 4 // - 4
(7/15)*x-(3/15)-4 = 0
(7/15)*x-1/5-4 = 0
7/15*x-21/5 = 0 // + 21/5
7/15*x = 21/5 // : 7/15
x = 21/5/7/15
x = 9
x = 9
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