Question

1) calcule as equações:

a) 5. (2x-4)= 30

b) 3x+ 12 =21

c) 2x + 1=12

Me ajudem!!!

Answer 1

a)10x-20=30
   10x=30+20
   10x=50
    x=50/10
    x=5

b)3x+12=21
  3x=21-12
  3x=9
  x=9/3
  x=3

c)2x+1=12
   2x=12-1
   2x=11
   x=11/2

Answer 2

a) 5 ( 2x - 4 ) = 30
10x - 20 = 30
10x = 30 + 20
x = 50 / 10
x = 5

b) 3x + 12 = 21
3x = 21 - 12
3x = 9
x = 9 / 3
x = 3

c) 2x + 1 = 12
2x = 12 - 1
2x = 11
x = 11 / 2
x = 5,5