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D( x )
x+1.5 = 0
x+1.5 = 0
x+1.5 = 0
x+1.5 = 0 // - 1.5
x = -1.5
x in (-oo:-1.5) U (-1.5:+oo)
2/(x+1.5) = 0.2 // - 0.2
2/(x+1.5)-0.2 = 0
2/(x+1.5)+(-0.2*(x+1.5))/(x+1.5) = 0
2-0.2*(x+1.5) = 0
1.7-0.2*x = 0
(1.7-0.2*x)/(x+1.5) = 0
(1.7-0.2*x)/(x+1.5) = 0 // * x+1.5
1.7-0.2*x = 0
1.7-0.2*x = 0 // - 1.7
-0.2*x = -1.7 // : -0.2
x = -1.7/(-0.2)
x = 8.5
x = 8.5
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