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Răspuns:
1490-1490: x=745
x=0:745
x=0
(49:x+51:x):5=4
49:x+51:x=20
49+51:2x=20
51:2x= -29
2x=-80
x= -40
[(25:x+20:x):3]+5=8
(25:x +20:x) :3= 3
25:x+20:x= 9
25+20:2x=9
20:2x= -16
2x= -36
x= -18