Răspuns :

Cpwid
12-(5 +x-2)=-2
12+2=5+x-2
14-3=x
x=11

a/2+3a=35           |*2
a+6a=70
7a=70
a=10

Miky93id
12- (3+x)= -2

-(3+x)= -2-12

-(3+x)= -14

3+x=14

x=14-3
x=11

a/2+3a=35  aducem la acelasi numitor

a+6a=70
7a=70
a=10

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