6x - 9 = 21 6x = 21 + 9 6x = 28 x = 28/6 Reduce to: x = 14/3
16x - 10x + 9 = 99 - 30 6x + 9 = 69 so 6x = 60 or x = 10
16x - 10x + 9*99 - 30 = 6x + 861
If that's -9 - 6x + 9, it simplifies to -6x
1+6x+6x+8 1+ 12x +8 12x + 9 = 21 + x
-6x + y = 9 (+6x) -> y = 6x + 9
-6x+9 = 45 -6x = 45-9 -6x = 36 x = -6
y=6x-9
-3
6x + 54x -9 = 60x - 9
24
Simplifying we get 6x + 9 = 69 so x = 10