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x in (-oo:+oo)
(x-5)/15 = 10/8 // - 10/8
(x-5)/15-(10/8) = 0
(x-5)/15-5/4 = 0
(4*(x-5))/(4*15)+(-5*15)/(4*15) = 0
4*(x-5)-5*15 = 0
4*x-95 = 0
(4*x-95)/(4*15) = 0
(4*x-95)/(4*15) = 0 // * 4*15
4*x-95 = 0
4*x-95 = 0 // + 95
4*x = 95 // : 4
x = 95/4
x = 95/4
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