21x + 16x + 55 = 166
21x + 16x = 166 – 55
37x = 111
x = 3
81y + 60 + 9y = 960
81y + 9y = 960 – 60
90y = 900
y = 10
59r – 19r + 125 = 565
59r – 19r = 565 – 125
40r = 440
r = 11
58d + 37d + 212 = 972
58d + 37d = 972 – 212
95d = 760
d = 8
21x + 16x + 55 = 166
21x + 16x = 166 – 55
37x = 111
x = 3
81y + 60 + 9y = 960
81y + 9y = 960 – 60
90y = 900
y = 10
59r – 19r + 125 = 565
59r – 19r = 565 – 125
40r = 440
r = 11
58d + 37d + 212 = 972
58d + 37d = 972 – 212
95d = 760
d = 8