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x in (-oo:+oo)
0.5*x+(4/3)*x = x+15 // - x+15
0.5*x+(4/3)*x-x-15 = 0
0.83333333*x-15 = 0 // + 15
0.83333333*x = 15 // : 0.83333333
x = 15/0.83333333
x = 18.00000007
x = 18.00000007
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