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(x+y)²-(y-2)²=(x-y)(x+y)+1 [tex] \left \{ {{y=2} \atop {x=2}} \right. [/tex]
5(x-3y+1)+11=2(x+3)+16


Răspuns :

5x-15y+5+11=2x+6+16
5x-15y+16=2x+22 |-16
5x-15y=2x+6 |-2x
3x-15y=6