Question

Alguém sabe fazer a 20,21,22,23,24 e a 25
Me ajuda e pra amanhã!!

Answer 1

Explicação passo-a-passo:

20)

__3-x___=__x-8__- __2x-3__

5 4 4

__3-x__=__x-8-2x+3__

5 4

__3-x__=__-x-5__

5 4

12-4x=-5x-25

-4x+5x=-25-12

x=-37

v={-37}

21)

__2__(x-1)+__1__(3-4x)=1

3 4

_2x_-_2_+__3__-__4x__=1

3 3 4 4

__2x-2__+__3-4x__=1

3 4

__8x-8+9-12x_=1

12

__8x-12x-8+9__=1

12

__-4x+1__=1

12

-4x+1=12

-4x=12-1

-4x=11 .(-1)

4x=-11

x=-11/4

V={-11/4}

22)

6x-10=_5_

3

18x-30=5

18x=5+30

18x=35

x=35/18

V={35/18}

23)

3x-2(x-1)=10

3x-2x+2=10

x+2=10

x=10-2

x=8

v={8}

24)

__x__+__3__=8

3 5

__5x+9__=8

15

5x+9=120

5x=120-9

5x=111

x=111/5

S={111/5}

25)

6x=12x-10

6x-12x=-10

-6x=-10 .(-1)

6x=10

x=10/6 ÷(2)

x=5/3

v={5/3}