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(8x-8y)/(8x+8y) = (x-y)/(x+y)Cancel down by 8; you have simplified the equation.
If you mean (9x-8y)(9x+8y) then it is 81x^2 minus 64y^2
-8x-8y=-64 -8y=8x-64 y=-x+8
If: 11x-8y = 32 Then: -8y = -11x+32 And: y = 1.375x-4 in slope-intercept form
2x + 8y --- has a GCF of 2= 2(x + 4y)