86- (14 + х) = 21
14 + х = 86 - 21
14 + х = 65
х = 65 - 14
х = 51
37 - (4+х) = 9
4 + х = 37 - 9
4 + х = 28
х = 28 - 4
х = 24
(1545+х) : 83 = 70
1545 + х = 83 * 70
1545 + х = 5810
х = 5810 - 1545
х = 4265
(90- х) + 60 = 150
90 - х = 150 - 60
90 - х = 90
х = 90 - 90
х = 0
