Solve the equations:

a) 9x+5=4x+30

b) 3(n+2)=21

c)2m-10=7m-15+5


  • (a)
  •  
  • 9x+5=4x+30
  • 9x - 4x = 30 - 5
  • 5x = 25
  • x = 25/5 = 5
  • Hence the value of x is 5.
  •  
  • (b)
  • 3(n+2) = 21
  • 3 * n + 3 * 2 = 21
  • 3n + 6 = 21
  • 3n = 21 - 6
  • 3n = 15
  • n = 15/3
  • n = 5
  • Hence the value of n is 5.
  •  
  • (c).
  • 2m - 10 = 7m - 15 +5
  • 2m - 7m = -10 + 10
  • -5m = 0
  • m = 0

  • 3

a)9x+5=4x+30

9x-4x=30-5

5x=25 x=25/5=5

b)3(n+2)=21

3n+6=21

3n=21-6

n=15/3=5

c)2m-10=7m-15+5

2m-10=7m-20

2m-7m=-20+10

-5m=-10

m=2

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  • 0

Answer:

A) 9x + 5 = 4x + 30

9x - 4x = 30 - 5

5x = 25

x = 25/5 = 5.

Ans: 5.

B) 3(n + 2) = 21

3n + 6 = 21

3n = 21 - 6 = 15

n = 15/3 = 5.

Ans: 5.

C) 2m - 10 = 7m - 15 + 5

2m - 7m = -15 + 5 + 10

-5m = - 15 + 15 = 0

- 5 m = 0

m = 0.

Ans: 0.

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