Perform the addition.
You know that 6 cows plus one cow is 7 cows, 6 kittens plus 1 kitten is 7 kittens,
and 6 computers plus 1 computer is 7 computers.
It should not surprise you to discover that [ 6x + 1x ] = 7x .
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-9
15xy-2xy-7x+x=13xy-6x
6x-2y
Simple,its just like this: 6x+1+7-3 =6x+8-3 =6x+5
-x2 + 6x + 16 = -(x2 - 6x - 16) = -(x - 8)(x + 2) = -(8 - x)(x + 2)