Question

A) 5x -2x += 23
b) 7x = 5x-1205
c)10x-140=3x+4x
d)-6x=13+5
...alguem pode me ajudar nessas questões?

Answer 1

a)

5x - 2x = 23
3x = 23
x = 23
       3
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b)

7x = 5x - 1205
7x - 5x = - 1205
2x = - 1205
x = - 1205
         2
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c)

10x - 140 = 3x + 4x
10x - 140 = 7x
10x - 7x = 140
3x = 140

x = 140
       3
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d)
    - 6x = 13 + 5
    - 6x = 18 (-1)
    6x = - 18
x = - 18
         6

x = - 3

Answer 2

a) 5x - 2x = 23
3x = 23
x = 23 / 3
 
b) 7x = 5x - 1205
7x - 5x = - 1205
2x = - 1205
x = - 1205 / 2

c) 10x - 140 = 3x = 4x
10x - 3x - 4x = 140
3x = 140
x = 140 / 3

d) - 6x = 13 + 5
- 6x = 18 / . (-9)
6x = - 18
x = - 18 / 6
x = - 3