It's an expression in 'x' and 'y'.
It may be simplified (cleaned up) to yield:
7x + 2y - 2x + 3y =
5x +5y
or
5 (x + y)
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(7x-3y) + (2x+5y) = 9x+2y
-4(7x-3y-z)-(-6)(9x-z+2)
the simplest form of 5x + 3y +2x - 6y is 7x-3y
x+7x+3y-y =8x+2y =2(4x+y)
7x = -3y + 12