Respuesta:
a) x = 15
b) x = 20
c) x = 8
d) ?
e) x = 7
f) x = 6
Explicación paso a paso:
a) x + 7 = 22
x = 22 -7
x = 15
b) 12 = x - 8
x = 12 + 8
x = 20
c) 3x = 24
x = 24 ÷3
x = 8
d) = 8
e) 17 = 3 + 2x
2x = 17 - 3
x = 14 ÷ 2
x = 7
f) 6x - 5 = 31
6x = 31 + 5
x = 36 ÷ 6
x = 6