7
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x is called a variable. It is an unknown quantity that is to be solved for.
16-X = 9
add X to both sides
16 = 9 + X
subtract 9 from both sides
7 = X
( of course you can just look at this problem and see what X is )
16x - 10x + 9 = 99 - 30 6x + 9 = 69 so 6x = 60 or x = 10
.25
If: 16x-15-6x = 13 Then: 10x = 28 And: x = 2.8.
x2 - 16x + 68 = 5 (x - 8)2 + 4 = 5 (x - 8)2 = 1 x - 8 = 1 or -1 x = 9 or 7
7.5625