Răspuns :
x-7x/18=2x/3-2.5
(18x-7x)/18=2x/3-2.5
11x/18=2x/3-2.5
2.5 e 5/2
11x/18=(4x-15)/6
18(4x-15)=66x
72x-270=66x
6x=270
x=45
(18x-7x)/18=2x/3-2.5
11x/18=2x/3-2.5
2.5 e 5/2
11x/18=(4x-15)/6
18(4x-15)=66x
72x-270=66x
6x=270
x=45
x-lungimea drumului
7/18 din x=x*7/18=7x/18 a parcurs in prima parte
x-7x/18 aducem la acelasi numitor
18x-7x/18=11x/18 -restul de drum ramas de parcurs
2/3 din x=2/3*x=2x/3
11x/18+2,5=2x/3 aducem la acelasi numitor (18)
11x+45=12x
11x-12x=-45
-x=-45
x=45
7/18 din x=x*7/18=7x/18 a parcurs in prima parte
x-7x/18 aducem la acelasi numitor
18x-7x/18=11x/18 -restul de drum ramas de parcurs
2/3 din x=2/3*x=2x/3
11x/18+2,5=2x/3 aducem la acelasi numitor (18)
11x+45=12x
11x-12x=-45
-x=-45
x=45