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D in (-oo:+oo)
D/4-2 = 4 // - 4
D/4-4-2 = 0
1/4*D-6 = 0 // + 6
1/4*D = 6 // : 1/4
D = 6/1/4
D = 24
D = 24
| 6/4-2=1 | | -2v+16=1-8v+-3v | | 4/5n=65 | | k-35=21 | | 1+7x=1+7x | | S+35=57 | | 5n-(2n-3)=2n-4(n+2) |