Question

b)7x-1=20
c)10x+1=-4-5
d)x+15=11

Answer 1

b)

$7x - 1 = 20 \\ 7x = 20 + 1 \\ 7x = 21 \\ x = \frac{ 21}{7} \\ x = 3$

c)

$10x + 1 = - 4 - 5 \\ 10x = - 4 - 5 - 1 \\ 10x = - 10 \\ x = \frac{ - 10}{10} \\ x = - 1$

d)

$x + 15 = 11 \\ x = 11 - 15 \\ x = - 4$