Respuesta :
you cant add or subtract or multiply or divide if the variables arent the same so the simplified version of -3x²ym + 7x - 5ymx² + 16x would be
-3x²ym - 5ymx² + 23x
-3x²ym - 5ymx² + 23x
I got -8mx^2y + 23x , you may review the image i've attached to see how I got my answer.