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x in (-oo:+oo)
(3/5)*(10*x+5) = 9 // - 9
(3/5)*(10*x+5)-9 = 0
3/5*(10*x+5)-9 = 0
3/5*(10*x+5)-9 = 0
6*x-6 = 0
6*x-6 = 0
6*x-6 = 0 // + 6
6*x = 6 // : 6
x = 6/6
x = 1
x = 1
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