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x in (-oo:+oo)
(0.3*x+2)/0.5+0.1*x = 0.5 // - 0.5
(0.3*x+2)/0.5+0.1*x-0.5 = 0
(0.3*x+2)/0.5+(0.1*0.5*x)/0.5+(-0.5*0.5)/0.5 = 0
0.3*x+0.1*0.5*x-0.5*0.5+2 = 0
0.35*x-0.25+2 = 0
0.35*x+1.75 = 0
(0.35*x+1.75)/0.5 = 0
(0.35*x+1.75)/0.5 = 0 // * 0.5
0.35*x+1.75 = 0
0.35*x+1.75 = 0 // - 1.75
0.35*x = -1.75 // : 0.35
x = -1.75/0.35
x = -5
x = -5
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