Question

2- Resolva as equações abaixo:
a) x + 5 = 8 - 2x
b) x - 4 = 3
c) x+6=5+ 2x
d) x-3 = -7
e) x + 9 = -1 +20 - 4x
f) x + 28 = 11 + 3x -10 + X
g) x - 109 = 5
h) x - 39 = -79
i) 10 = x + 9
j) 15 = x + 20​

Answer 1

a) x + 5 = 8 - 2x

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

b) x - 4 = 3
x = 3 + 4
x = 7

c) x + 6 = 5 + 2x
6 - 5 = 2x - x
1 = x

d) x - 3 = - 7
x = - 7 + 3
x = -4

e) x + 9 = - 1 + 20 - 4x
x + 4x = 19 - 9
5x = 10
x = 2

f) x + 28 = 11 + 3x - 10 + x
28 - 11 + 10 = 4x - x
27 = 3x
9 = x

g) x - 109 = 5
x = 5 + 109
x = 114

h) x - 39 = - 79
x = - 79 + 39
x = - 40

i) 10 = x + 9
10 - 9 = x
1 = x

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