Question

Equação do 1° grau
A) - 2x + 3 = -12
B) X + 7 = -8
C) 2. (X + 2)= -3. (X + 6)
D) 5x = 125
E) 5x + = 2x - 12
F) 3. (X + 4) = -3 . (X + 5)
G) 12x + 3 = - 3x -15
H) 7x + 2 = -2x -16 +5x
I) 10 . ( X + 6) = 2 (x + 6)
J) 12x = 144
K) x + 12 = -20
L) 3x = - 5x + 64

Answer 1

A)

-2x + 3 = -12

-2x = -12 - 3

-2x = -15

2x = 15

x = 15/2

x = 7,5

B)

x + 7 = -8

x = -8 - 7

x = -15

C)

2 . (x + 2)= -3 . (x + 6)

(2x) + (2 . 2) = (-3x) + (-3 . 6)

2x + 4 = -3x - 18

2x + 3x = -18 - 4

5x = -22

x = -22/5

x = -4,4

D)

5x = 125

x = 125/5

x = 25

E)

5x = 2x - 12

5x - 2x = -12

3x = -12

x = -12/3

x = -4

F)

3 . (x + 4) = -3 . (x + 5)

(3x) + (3 . 4) = (-3x) + (-3 . 5)

3x + 12 = -3x - 15

3x + 3x = -15 - 12

6x = -27

x = -27/6

x = -4,5

G)

12x + 3 = - 3x -15

12x + 3x = -15 - 3

15x = -18

x = -18/15

x = -1,2

H)

7x + 2 = -2x - 16 + 5x

7x + 2x - 5x = -16 - 2

4x = -18

x = -18/4

x = -4,5

I)

10 . ( x + 6) = 2 . (x + 6)

(10x) + (10 . 6) = (2x) + (2 . 6)

10x + 60 = 2x + 12

10x - 2x = 12 - 60

8x = -48

x = -48/8

x = -6

J)

12x = 144

x = 144/12

x = 12

K)

x + 12 = -20

x = -20 - 12

x = -32

L)

3x = - 5x + 64

3x + 5x = 64

8x = 64

x = 64/8

x = 8