Question

como fazer essas contas
4x+5=2x+5

x-5=2x+15

3x+7=20-10x

7x+5=30-2x

4x+9=x-6

5(3x+2)=4-4x-10

2x+4-x=(2x+1)

5x-3+2x=x+3x

Answer 1

Como fazer essas contas 

BASTA isolar o (x))

4x+5=2x+5   ( ATENÇÃO NO SINAL)
4x +5 - 2x = 5
4x - 2x = 5 - 5
2x = 0
x = 0/2
x = 0

x-5=2x+15
x - 5 - 2x = 15
x - 2x = 15 + 5 
- 1x = 20
x = 20/-1
x = - 20/1
x = - 20

3x+7=20-10x
3x + 7 + 10x = 20
3x + 10x = 20 - 7
13x = 13
x = 13/13
x =  1


7x+5=30-2x
7x + 5 + 2x = 30
7x + 2x = 30 - 5
9x = 25
x = 25/9

4x+9=x-6
4x + 9 - x = - 6
4x - x = - 6 - 9
3x = - 15
x = - 15/3
x = - 5

 5(3x+2)=4-4x-10
15x + 10= 4 - 10 - 4x
15x + 10= - 6 - 4x
15x + 10 + 4x = - 6
15x + 4x = - 6 - 10
19x = - 16
x = - 16/19

2x+4-x=(2x+1)
2x - x + 4 = 2x + 1
1x + 4 = 2x + 1
1x + 4 - 2x = 1
1x - 2x = 1 - 4
- 1x = - 3
x = -3/-1
x= + 3/1
x = + 3


5x-3+2x=x+3x
5x + 2x - 3 = 4x
7x - 3 = 4x
7x = 4x + 3
7x - 4x = 3
3x = 3
x = 3/3
x = 1