Question

1) -3x - 4 = 0
2) -8x + 7 = 0
3) 10x + 25 = 0
4) 2x - 20 = 0
5) 5x - 11 = 8x + 5

Answer 1

1) 
- 3x - 4 = 0
- 4 = 3x
3x = - 4
x = - 4/3
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2)
- 8x + 7 = 0
7 = 8x
8x = 7
x = 7/8
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3)
10x + 25 = 0
10x = - 25 (:5)
2x = - 5
x = - 5/2
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4)
2x - 20 = 0
2x = 20 (:2)
x = 10
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5)
5x - 11 = 8x + 5
- 11 - 5 = 8x - 5x
- 16 = 3x
3x = - 16
x = - 16/3

Answer 2

1)-3 x - 4 = 0
-3 x = 4
x = -4/3
2)-8 x +7 = 0
-8 x = -7
x = 7/8
3)10 x + 25 = 0
10 x =-25 
x = -25/10
x =-2,5
4)2 x-20=0
2 x=20
x = 20/2
x = 10
5) 5 x - 11 = 8 x + 5
-11-5=8 x -5 x
-16 = 3 x
3 x = -16
x = -16/3