Question

calcule o valor de x:
2x+7=x-9

4(x+3)=5(x-1)

-2(x-1)=2x+3x+8

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

x(x+1)-x=9​

Answer 1

2x+7=x-9

2x - x = - 9 - 7

x = - 16

4(x+3)=5(x-1)

4x + 12 = 5x - 5

4x - 5x = - 5 - 12

- x = - 7 ...(-1)

x = 7

-2(x-1)=2x+3x+8

- 2x + 2 = 2x + 3x + 8

- 2x - 2x - 3x = 8 - 2

- 7x = 6 ...(-1)

7x = -6

x = -6/7

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

3x + 4x - 4 = 2x + 1

3x + 4x - 2x = 1 + 4

5x = 5

x = 5/5

x = 1

x(x+1)-x=9

x^2 + x - x = 9

x^2 = 9

x = √9

x = 3

Espero ter ajudado :)