(900)/(10.5+30x)=40

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Solution for (900)/(10.5+30x)=40 equation: 


D( x )

30*x+10.5 = 0

30*x+10.5 = 0

30*x+10.5 = 0

30*x+10.5 = 0 // - 10.5

30*x = -10.5 // : 30

x = -10.5/30

x = -0.35

x in (-oo:-0.35) U (-0.35:+oo)

900/(30*x+10.5) = 40 // - 40

900/(30*x+10.5)-40 = 0

900/(30*x+10.5)+(-40*(30*x+10.5))/(30*x+10.5) = 0

900-40*(30*x+10.5) = 0

480-1200*x = 0

(480-1200*x)/(30*x+10.5) = 0

(480-1200*x)/(30*x+10.5) = 0 // * 30*x+10.5

480-1200*x = 0

480-1200*x = 0 // - 480

-1200*x = -480 // : -1200

x = -480/(-1200)

x = 2/5

x = 2/5

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