Game Algebra for class 8

You have the formula of algebra for this game and pieces of an equation. The equation uses your formula. You must guess values of a,b and c. You must use Drag and Drop for the right answer. You can use tips. Sometimes the tip is the right answer. The tip has a red background. Use the black button near the face for the tip. When you use the tip, you spend the face. You can get the face when you have right answer without the tips.