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=5x² + 3x² + 2x + 4x
=8x² + 6x
b) 7x² - 5y² + 4x² - 3y²
=7x² + 4x² + 5y2 - 3y²
=11x² + 2y²
c) -9m - 4n³ + 4m - 3n³
=-9m + 4m + 4n³ - 3n³
=-5m + n³
mohon maaf klo jawabannya ada yang salah