Math puzzle - Nine game

Challenge yourself with this math puzzle game: if you like maths, this game is for you. Goal of the game is to insert numbers from 1 to 9 - without repetitions - in the green cells in a way that, following the operations shown in the red cells (+, -, X), the results must be equal to the ones in the last column and in the last row (yellow cells). Choose the green cell where you want to insert the number through the number pad and then touch Enter. Touch and hold icons for:
The first one catches the screenshot and saves it
The second one deletes only the green cells
The third one gives the solution
The fourth one creates another combination