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x in (-oo:+oo)
(3/5)*(x-10) = 9 // - 9
(3/5)*(x-10)-9 = 0
3/5*(x-10)-9 = 0
3/5*(x-10)-9 = 0
3/5*x-15 = 0
3/5*x-15 = 0
3/5*x-15 = 0 // + 15
3/5*x = 15 // : 3/5
x = 15/3/5
x = 25
x = 25
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