7-2x+3y-(3x-y)-(2x-5y+11
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=> 7-2x+3y-(3x-y)-(2x-5y)+11
=> 7-2x+3y-3x+y-2x+5y+11
=> 7+11-2x-3x-2x+3y+y+5y
=> 18+x(-2-3-2)+y(3+1+5)
=> 18+x(-7)+y(9)
=> 18-7x+9y
=> 9y-7x+18 _____[ANSWER]
=> 7-2x+3y-3x+y-2x+5y+11
=> 7+11-2x-3x-2x+3y+y+5y
=> 18+x(-2-3-2)+y(3+1+5)
=> 18+x(-7)+y(9)
=> 18-7x+9y
=> 9y-7x+18 _____[ANSWER]
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