It is the same. The equation "x + y" is the exact same as "x + y." There is no difference.
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YES!!! x + y = y + x Think numbers. 2 + 3 = 5 3 + 2 = 5
xy + x + y + 1 = (x + 1)(y + 1).
y = sqrt X + 3sqrt X is the same as y = 4 sqrt X
xz + x + yz + y = (x + y)(z + 1)
xy plus 2x plus 4y plus 8 or (xy+2x) + (4y+8) or x(y+2) + 4(y+2) or (x+4)(y+2)