What Number Fits Into The Last Triangle?

Find the number which fits into the last blue triangle (replace the red question mark with the correct number). Look at the numbers in the corners of the triangles â€“ they give you hint how to solve this puzzle.
The top number is not so important to solve this math puzzle
SHOW ANSWER
Correct answer: 7. The result is a sum of two numbers below the triangle. In first case, itâ€™s 1+7=8, second case 5+4=9, third case 9+0=9, fourth case 4+3=7 which is the final answer to this math puzzle
THE ANSWER IS 7
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