Question

urgente
matemática:

1) 5x+x-4=4

2) 8x - 9 -x = -1
----------------
5
3) 5x=2x+3

4)3 • (2-2x)= -7x

5) 4•(2-2x)+7x=5•(3+2x)

6) 6•(x-3)=7•(x+1)-16

7) x = 8
--- ---
3 9

8) 1 = x
--- ---
3 42

Answer 1

1)
5x+x-4=4
6x=4+4
6x=8
x=8/6÷(2)
x=4/3

2) 8x - 9 -x = -1
----------------
----->5

8x-9-x=-5

8x-x=-5+9

7x=4

x=4/7



3)
5x=2x+3
5x-2x=3
3x=3
x=3/3x
x=1



4)

3 • (2-2x)= -7x
6-6x= -7x
-6x+7x= -6
x= -6


5)
4•(2-2x)+7x=5•(3+2x)

8-8x+7x=15+10x
-8x+7x-10x=15-8
-11x=7*(-1)
x= -7/11

6)

6•(x-3)=7•(x+1)-16
6x-18=7x+7-16
6x-7x= -9+18
-x = 8*(-1)
x= -8

7) x = 8
--- ---
3 9

9x=24
x=24/9÷(3)
x= 8/3

8) 1 = x
--- ---
3 42

3x=42
x=42/3
x=14