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x in (-oo:+oo)
50 = (x+1)/0.1-(0.7*x)+x // - (x+1)/0.1-(0.7*x)+x
0.7*x-((x+1)/0.1)-x+50 = 0
0.7*x-10*(x+1)-x+50 = 0
0.7*x-10*(x+1)-x+50 = 0
50-9.3*x-x-10 = 0
50-10.3*x-10 = 0
40-10.3*x = 0
40-10.3*x = 0
40-10.3*x = 0 // - 40
-10.3*x = -40 // : -10.3
x = -40/(-10.3)
x = 3.88349515
x = 3.88349515
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