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x in (-oo:+oo)
(15*x)/4-3 = 7 // - 7
(15*x)/4-7-3 = 0
15/4*x-10 = 0 // + 10
15/4*x = 10 // : 15/4
x = 10/15/4
x = 8/3
x = 8/3
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