Răspunsuri

2014-10-14T23:13:43+03:00
75-x-35a+5b 
stiind ca a+b=8 
atunci 75-x-35+5+8
⇒75-x-35=13
⇒75-x=13+35
⇒75-x=48
⇒x=75-48
⇒x= 27