Question

a) 3 - 7 × = -21

b) 8 × - 25 = 5 + 2 ×

Answer 1

A)
3 - 7x = - 21
3 + 21 = 7x
24 = 7x
7x = 24
x = 24/7

b)
8x - 25 = 5 + 2x
8x - 2x = 5 + 25
6x = 30
x = 30/6
x = 5