Respuesta :

Answer: 
–7.5 = x

Explanation: 
22 = x – 3x + 7 
Subtract 7 from both sides:
22 – 7 = x – 3x + 7 – 7 
15 = x – 3x 
15 = –2x 
Divide by –2 on both sides:
15 ÷ –2 = –2x ÷ –2 
–7.5 = x