(-2x² + wx - 4) - (x² + 5x + 6) = -3x² - 10 Distribute/multiply - into (x² + 5x + 6)
-2x² + wx - 4 - x² - 5x - 6 = -3x² - 10 Combine like terms
-3x² + wx - 5x - 10 = -3x² - 10 Add 10 on both sides
-3x² + wx - 5x = -3x² Add 3x² on both sides
wx - 5x = 0 Add 5x on both sides
wx = 5x Divide x on both sides
w = 5