Respuesta :

Answer:

x=31

Step-by-step explanation:

10x -40 -15-8x=7

2x - 40 -15 =7

2x -55 =7

2x-55+55 = 7 + 55

2x=62

2x/2=62/2

x=31

eldusa

Step-by-step explanation:

10x-40-15+8x=7

2x-55=7

2x=7+55

2x=62

X=31