A-Z=15
A²-Z²=675
(A-Z) (A+Z)= 675 ............⇒15(A+Z)=675
A+Z=675/15
A+Z=45
A=30
Z=15
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A-Z=15
A²-Z²=675
(A-Z) (A+Z)= 675 ............⇒15(A+Z)=675
A+Z=675/15
A+Z=45
A=30
Z=15