Упростите выражение:а)(a+5b)(a-b+3)-(a-b)(a+5b-3)б)(x+3y)(x+y+2)-(x+y)(x+3y+2)
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б) x²+xy+2x+3xy+3y²+6y-x²-3xy-2x-xy-3y²-2y=4y
б)...=