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x in (-oo:+oo)
0.5*x+(4/5)*x = x+9 // - x+9
0.5*x+(4/5)*x-x-9 = 0
0.3*x-9 = 0 // + 9
0.3*x = 9 // : 0.3
x = 9/0.3
x = 30
x = 30
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