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x in (-oo:+oo)
(15*x)/3 = 7/2 // - 7/2
(15*x)/3-(7/2) = 0
(15*x)/3-7/2 = 0
5*x-7/2 = 0 // + 7/2
5*x = 7/2 // : 5
x = 7/2/5
x = 7/10
x = 7/10
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