Question

a) 2x + 10 = x + 70
b) 9x + 120 = 300
c) 2x + 5 = 120
d) 6x -11 = 5x- 3
e) 10x + 6 = 8x
f) 8x -5 -5 = -2x +1

Answer 1

A) 2x + 10 = x + 70

2x - x = 70 - 10
X = 60

b) 9x + 120 = 300

9x = 300 - 120
9x = 180
X = 180/9
X = 20

c) 2x + 5 = 120

2x = 120 - 5
2x = 115
X = 115/2
X = 57,5

d) 6x -11 = 5x- 3

6x -5x = -3 + 11
X = 8

e) 10x + 6 = 8x

10x -8x = -6
2x = -6
X = -6/2
X = -3

f) 8x -5 -5 = -2x +1

8x + 2x = 1 + 5 + 5
10x = 11
X = 11/10
X = 1,1

Answer 2

a) 2x + 10 = x + 70   =>    2x - x = 70 - 10   =>    x = 60
b) 9x + 120 = 300    =>   9x = 300 - 120   =>   9x = 180  =>  x = 180 : 9 =>  x=20
c)2x + 5 = 120   =>   2x = 120 - 5   =>   2x = 115  =>   x = 115:2  =>  x=57,5
d)6x - 11 = 5x - 3  =>   6x - 5x = -3 + 11  =>  x = 8
e) 10x + 6 = 8x   =>   10x - 8x = -6   =>   2x = -6   =>   x = -6:2   =>  x = -3
f)8x - 5 - 5 = -2x + 1   =>   8x + 2x = 1 +5 + 5   =>   10x = 6   =>   x = 6:10   =>  x = 0,6