Question

2X=18
7x=49
x+x=15
x-2x=-7
2x+x-4=7x+1
-3x+x=-5+2
-5x+2x=-7-9
-3x=15
-x =-9
----
7
3x+x=7-12

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Answer 1

a)

2x = 18
x = 18/2
x = 9
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
b)
7x = 49
x = 49/7
x = 7
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
c)
x + x = 15
2x = 15
x = 15/2
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
d)
x - 2x = - 7
- x = - 7 ( - 1)
x = 7
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
e)
2x + x - 4 = 7x + 1
3x - 4 = 7x + 1
- 4 - 1 = 7x - 3x
- 5 = 4x
4x = - 5
x = - 5/4
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
f)
- 3x + x = - 5 + 2
- 2x = - 3 ( - 1)
2x = 3
x = 3/2
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
g)
- 5x + 2x = - 7 - 9
- 3x = - 16 ( - 1)
3x = 16
x = 16/3
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
h)

- 3x = 15 ( - 1)
3x = - 15
x = - 15/3
x = - 5
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
i)

- x  = - 9
----
  7

- x = - 9.7
- x = - 63  (-1)
x = 63 
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
j)

3x + x = 7 - 12
4x = - 5
x = - 5/4