Question

Resolva as equações,sendo u=q a)6x+3=21
B)3(x+2)-(2x-5)=3
C)13×-21=17x-30+8
D)x+3/4 -3x-1/5 = -5

Answer 1

Resolvendo as equacoes seguintes :

A.-) Solucao :
.......~~~~~~~~~
6X + 3 = 21

6X = 21 - 3

6X = 18

X = 18/6

X = 3

B.-) Solucao :
........~~~~~~~~
3(X + 2) - 2(X - 5) = 3

3X + 6 - 2X + 10 = 3

X + 16 = 3

X = 3 - 16

X = - 13

C.-) Solucao :
........~~~~~~~~
13X - 21 = 17X - 30 + 18

13X - 21 = 17X - 12

13X - 17X = - 12 + 21

- 4X = 9

X = - 9/4

D.-) Solucao :
........~~~~~~~~
X + 3/4 - 3X - 1/5 = - 5

- 2X + 3/4 - 1/5 = - 5

4 - 5|2
2 - 5|2
1 - 5|5
1 - 1|
m.c m= 2x2x5 => 4 x 5 => 20

- 2X + 15/20 - 4/20 = - 5

- 2X + 11/20 = - 5

- 2X = - 5 - 11/20

- 2X = -100/20 - 11/20

- 2X = - 111 / 20

- X = - 111 /20/2

- X = -111/20 x 2

- X = - 222/20...(-1)

X = 222/20...(÷2)

X = 111/10