Question

en cuentra el valor de x
3x-21=7x-105
2x+120= 15x-60
2(4x+12)+1=10(x-1)+2

Answer 1

Respuesta:

3x-21=7x-105

3x-7x= -105+21

-4x= -84 (-1)

4x= 84

x= 84/4

x=21

2x+120=15x -60

2x-15x =-60-120

-13x= -180(-1)

13x= 180

x= 180/13

x= 13.8

2(4x+12)+1 = 10(x-1)+2

8x+ 24+2= 10x-1+2

8x-10x = -1+2-24-2

-2x= -25(-1)

2x= 25

x= 25/2

x= 12.5