if 2 x + y = 7 and x + 2 y = 8 , then ( x + y ) / 3 =
"we have two equations : 2 x + y = 7 x + 2 y = 8 notice that something nice happens when we add them . we get : 3 x + 3 y = 15 divide both sides by 3 to get : x + y = 5 so , ( x + y ) / 3 = 5 / 3 answer : e"
divide(add(divide(subtract(multiply(7, 2), 8), subtract(multiply(2, 2), const_1)), subtract(7, multiply(2, divide(subtract(multiply(7, 2), 8), subtract(multiply(2, 2), const_1))))), 3)