Simplify :
3y – y {2x (x + y)}
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Given 7x(x−y)−3(x2−y2)3y(x−y)−2x(y−2x)
=7x2−7xy−3x2+3y23xy−3y2−2xy+4x2
=4x2−7xy+3y24x2+xy+3y2
=4x2−4xy−3xy+3y24x2+4xy−3xy−3y2
=4x(x−y)−3y(x−y)4x(x+y)−3y(x+y)
=(4x−3y)(x−y)(4x−3y)(x+y)
=x−yx+y
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