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x in (-oo:+oo)
(3/5)*x+6+9 = 12 // - 12
(3/5)*x-12+6+9 = 0
3/5*x+3 = 0 // - 3
3/5*x = -3 // : 3/5
x = -3/3/5
x = -5
x = -5
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