Question 22206
9x-4=7x+8 You are basically trying to find x by manipulating equation, but it also has to stay equation - to assure that you need to always manipulate with both sides.You can for instance add,subtract,multiply or divide equation by any number you please.

9x-4=7x+8
9x-4-7x=8 (I subtracted 7x)
9x-7x=8+4 (I added 4)
2x = 12   ( I just evaluated it)
x = 6      (divided by 2)

- here is what it looks like after plotting...
{{{ graph( 300, 200, -5, 10, -10, 10, x-6) }}}