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x in (-oo:+oo)
0.5*x+(4/3)*x = x+10 // - x+10
0.5*x+(4/3)*x-x-10 = 0
0.83333333*x-10 = 0 // + 10
0.83333333*x = 10 // : 0.83333333
x = 10/0.83333333
x = 12.00000005
x = 12.00000005
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