Решите уравнение:
а) 25z + 49 = 149;
б) 13 + 10t = 163;
в) 9у − 54 = 162;
г) 181 − 8t = 45.
25z + 49 = 149
25z = 149 − 49
z = 100 : 25 = 4
13 + 10t − 163
10t = 163 − 13
t = 150 : 10 = 15
9y − 54 = 162
9 * у = 216
y = 216 : 9 = 24
181 − 8r = 45
8r = 181 − 45
r = 136 : 8 = 17