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x in (-oo:+oo)
0.5*x+(4/5)*x = x+3 // - x+3
0.5*x+(4/5)*x-x-3 = 0
0.3*x-3 = 0 // + 3
0.3*x = 3 // : 0.3
x = 3/0.3
x = 10
x = 10
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