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=3x²-3x-2
2) m²-m² +3mn+mn+2n²-5n²
=4mn-3n²
3)x²+3x²y-x²+5x²-xy²+3xy²
=4x²y+4x²+2xy²
3x² - 5x - 2x + 4x -9 +7 =
3x² - 3x - 2
2) m² + 3mn =2n² - m² + mn - 5n²
m² - m² - 5n² + 3mn + mn
-5n² + 4mn
3) x²y - x² + 3x²y - xy² + 5x² + 3xy²
x²y + 3x²y - x² + 5x² - xy² + 3xy²
4 x²y + 4x² + 2xy²
2x (2xy + 2x + y²)