54y – 36y – 9 = 153
54y – 36y = 153 + 9
18y = 162
y = 9
(15и-21)*3+27=234
раскроем скобки
45и-63+27 = 234
45и-270 = 0
45и = 270
и = 6
(36t+98):14=25
36t+98=25*14
36t+98=350
36t=350-98
36t=252
t=252/36
t=7
(23x+30x+42):6=21
23x+30x+42=21*6
23x+30x+42=126
23x+30x=126-42
53x=84
x=84/53
х=1,58490566038
54y – 36y – 9 = 153
54y – 36y = 153 + 9
18y = 162
y = 9
(15и-21)*3+27=234
раскроем скобки
45и-63+27 = 234
45и-270 = 0
45и = 270
и = 6
(36t+98):14=25
36t+98=25*14
36t+98=350
36t=350-98
36t=252
t=252/36
t=7
(23x+30x+42):6=21
23x+30x+42=21*6
23x+30x+42=126
23x+30x=126-42
53x=84
x=84/53
х=1,58490566038