What is 7x+ -x

7x-1x= 6x

you forgot the x mathematician!

 

you can think of it as 7 xboxes - 1 xbox = 6xboxes

When you add a negative number, that's the same as subtracting. So 7x + (-x) = 7x - x.

When you have just an x it is an implied 1x. So we have: 7x - 1x.

Then you can subtract the numbers in front of the variables: 7 - 1 = 6, so 7x - 1x = 6.