a+2x-2:2+(2+2):2=7 a=

Răspuns :

a+2x-2:2+(2+2):2=7

a+2x-1+4:2=7

a+2-1+2=7

a+2-1=7-2

a+2-1=5

a+2=5+1

a+2=6

a=6-2

a=4