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D( x )
10^9*x = 0
10^9*x = 0
10^9*x = 0
1000000000*x = 0 // : 1000000000
x = 0
x in (-oo:0) U (0:+oo)
(10^6*x)/(10^9*x) = 0
1/1000 = 0
x belongs to the empty set
x belongs to the empty set
| 3n^3+12n^2-36n=0 | | 121=x+2x+(x+21) | | x+61=4x-2 | | y=23+5X | | 18=13+6 |