( 7 + x) / ( 13 + x) = 2/3
zatem
3*( 7 + x) = 2*( 13 + x)
21 + 3 x = 26 + 2 x
3 x - 2 x = 26 - 21
x = 5
=====
Odp. Należy dodać liczbę 5.
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( 7 + x) / ( 13 + x) = 2/3
zatem
3*( 7 + x) = 2*( 13 + x)
21 + 3 x = 26 + 2 x
3 x - 2 x = 26 - 21
x = 5
=====
Odp. Należy dodać liczbę 5.
==============================