Question

Quanto é:

1)2.(x+3) <15

2)9.(2x+3) >5.(x+10)

3)7.(x-1)+4x<8(x-3)

Answer 1

a) 2x + 6 <15
    2x < 15-6
    2x< 9
     x<9/2
     x<4,5

b) 18x+27>5x+50
    18x-5x>50-27
      13x>23
       x>23/13

c) 7x -7+4x<8x-24
   7x+4x-8x<-24+7
   7x-4x<-17
      3x<-17
       x<-17/3                       ok

Answer 2

1)2.(x+3) <15 
2x + 6 < 15
2x < 15 - 6
2x < 9
x < 9/2
x< 4,5


2)9.(2x+3) >5.(x+10)
18x + 27 > 5x + 50
18x - 5x > 50 - 27
13 x > 23
x > 23/13


3)7.(x-1)+4x<8(x-3)
7x - 7 + 4x < 8x - 24
7x + 4x - 8x < -24 + 7
3x < - 17
x < -17/3