(x+5y)^+(2x+10y)(3x-y)+(3x-y)^
=(x+5y)^+2(x+5y)(3x-y)+(3x-y)^
=[(x+5y)+(3x-y)]^
=(4x+4y)^
=16(x+y)^
(x+5y)^+(2x+10y)(3x-y)+(3x-y)^
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