The right option is (D) 5
−2x²+wx−4−(x²+5x+6)=−3x²−10
Add 3x^2 to both sides.
wx−3x²−5x−10+3x²=−3x²−10+3x²
wx−5x−10=−10
Add 5x to both sides.
wx−5x−10+5x=−10+5x
wx−10=5x−10
Add 10 to both sides.
wx−10+10=5x−10+10
wx=5x
Divide both sides by x.
wx /x = 5x/x
w=5
