a x b = 36 = > b = 36-a
( a + 7 ) x b = 99 => (a+7) x ( 36-a )=99
=> 36a -a patrat +252 -7a = 99
=> 29a-a patrat+252 = 99
=>29a-a patrat = 99 -252
=>29a-a patrat =153
=>a-a patrat = 153/29
=>a- a patrat = 17
=> a-a = radical din 17
=> a = 17 => b = 36-a
b= 36-17
b= 19
a = 17 ; b = 19
CORONITA >?