Berapa ya totalnya?

rumus x,y,a ibu x , ayh x , bby a Q = x + y - a = ? 3x = 15 => 15 : 3 = 5 3y = 12 => 12 : 3 = 4 3a = 6 => 6. : 3 = 2 x = 5 y = 4 a = 2 x + y - a ( 5+ 4 ) - 2 9 - 2 7 😂😂😂😂🥰