a) (44-x) + (34-18+2) - 58=3
(44-х)+34-18+2-58=3
(44-х)-40=3
44-х=43
-х=43-44
х=1
б) (26+37+х)+(44-13-18)-16 -18 -26 = 51
63+х + 13 - 16 -18 -26 =51
76 - 60 + х = 51
16 +х = 51
х = 51 - 16
х = 35
в) (44-15+x)-(86-57)+43-11=59
29+x-29+43-11=59
х+43-11=59
х+32=59
х=59-32
х=27