if 2 x + y = 7 and x + 2 y = 10 , then ( x + y ) / 3 =
"we have two equations : 2 x + y = 7 x + 2 y = 10 notice that something nice happens when we add them . we get : 3 x + 3 y = 17 divide both sides by 3 to get : x + y = 17 / 3 so , ( x + y ) / 3 = 17 / 9 answer : c"
divide(add(divide(subtract(multiply(7, 2), 10), subtract(multiply(2, 2), const_1)), subtract(7, multiply(2, divide(subtract(multiply(7, 2), 10), subtract(multiply(2, 2), const_1))))), 3)