This is not correct. If x=11, then 9+x=20. In order for 9+x=21 to be correct, x would have to be equal to 12.
3x-1=11 x=4 x^2+x=20
x equals 8
x=6=x=5+x=13+x=20 x cannot = x+5. This question has no answer.
4x =20x=20/4x=5
x + 6
3x+5=20 x=5 since 5x3+5=20
Let the number is x So, X+20=69 X=69-20 X=49 THE NUMBER IS 49 SO, 49 plus 20 equal to 69 .•.
x=-11
x = 20
x2+12x+11=0 (x+11)(x+1)=0 x=-11 or x=-1
x=6