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x in (-oo:+oo)
(7*x)/15 = 7/15 // - 7/15
(7*x)/15-(7/15) = 0
(7*x)/15-7/15 = 0
7/15*x-7/15 = 0 // + 7/15
7/15*x = 7/15 // : 7/15
x = 7/15/7/15
x = 1
x = 1
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