Question

ayudaaa pliss
resolver
* 7 (18 -x) - 6 (3 - 5x) = -3 (2x + 5) -12
* (x+1) (2x +5) = (2x +3) ( x -4) +5
* 3x + [ -5x - (x +3)]= 8x + (-5x -9)

Answer 1

Respuesta:

7 (18 -x) - 6 (3 - 5x) = -3 (2x + 5) -12

126 - 7x - 18 + 30x = -6x - 15 - 12

23x + 108 = -6x - 27

23x + 6x = -27 -108

29x = -135

X = -135/29

* (x+1) (2x +5) = (2x +3) ( x -4) +5

2x^2 + 5x + 2x + 5 = 2x^2 - 8x + 3x - 12 + 5

2x^2 + 7x + 5 = 2x^2 - 5x - 7

2x^2 - 2x^2 + 7x + 5x = -7 - 5

12x = -12

X = -12/12

X = -1

* 3x + [ -5x - (x +3)]= 8x + (-5x -9)

3x + [ -5x - x - 3 ] = 8x - 5x - 9

3x + [ -6x - 3] = 3x - 9

3x - 6x - 3 = 3x - 9

-3x - 3 = 3x - 9

-3x - 3x = -9 + 3

-6x = -6

X = -6/-6

X = 1