Question

f) x + 8 = 10 g) x + 20 = 15 h) x - 10 = 4 i) x + 8 = 7 j) x + 11 = 0 k) 3 x + 9 = - 3 l) 2 x + 3 = 17 m) 4 x - 5 = 19 n) 5 x - 1 = - 6 o) 8 + 7 x = 22

Answer 1

f ) x = 10 -8 = 2
g) x = 15-20 = -5
h) x = 4 + 10 = 14
i) x = 7 - 8 = -1
j) x = 0 -11 = -11
k) x = 3x = -12 x = -12/3 = -4
l) 2x = 14  x = 14/2 = 7
m) 4x = 24  x = 24/4 = 6
n) 5x = -5  x = -5/5 = -1
o) 7x = 14  x = 14/7 = 2

Answer 2

F) x + 8 = 10
x = 10 - 8
x = 2

G) x + 20 = 15
x = 15 - 20
x = -5

H) x - 10 = 4
x = 4 +10
x = 14

I) x + 8 = 7
x = 7 - 8
x = -1

J) x + 11 = 0
x = 0 - 11
x = -11

K) 3x + 9 = -3
3x = - 3 - 9
3x = -12
x = -12/3
x = -4

L) 2x + 3 = 17
2x = 17 - 3
2x = 14
x = 14/2
x = 7

M) 4x - 5 = 19
4x = 19 +5
4x = 24
x = 24/4
x = 6

N) 5x - 1 = -6
5x = - 6 + 1
5x = -5
x = -5/5
x = -1

O) 8 + 7x = 22
7x = 22 - 8
7x = 14
x = 14/7
x = 2
 
OBS. : Sempre que um número muda de lado, o sinal dele se altera... por exemplo : - 1 = x ---> x = + 1 ; 2.x = 1 ---> x = 1/2