[Dividing both side by 10]
p =10
(b)
[Subtracting both sides 10]
[Dividing both side by 10]
⇒ p = 9
(c)
[Multiplying both side by 4]
⇒ p = 20
(d)
[Multiplying both side by - 3]
⇒ p = -15
(e)
[Multiplying both side by 4]
[Dividing both side by 3]
⇒ p = 6
(f)
3s = -9 [Dividing both side by 3]
3s/3 = -9/3
⇒ s = -3
(g) 3s+12 = 0
⇒ 3s + 12 - 12= 0 - 12 [subtracting both side 12]
⇒ 3s = -12 [Dividing both side by 3]
⇒ 3s/3 = -12/3
⇒ s = -4