45ab-25a5 b4+15a2 b3 - 5ab ( 9 – 5a4b3 + 3ab2 ), ab+ac+a2+2a+2c+2b - ( a + 2 ) (a + b + c ), 10m3 n+4m2 n2-2m2 n - 2m2n ( 5m + 2n – 1 ), 4(a+b)-(a+b)+c(a+b) - ( a + b ) ( 4 – 1 + c ), 2x+x+by+aby - x ( 3 ) + by ( 1 + a ), (x+2)(x2-2x+4)-x-2 - ( x + 2 ) ( x2 – 2x - 3 ), a2 x+a2 y+b2 x+b2 y - ( a2 + b2 ) ( x + y ), 5m-2n+3y(5m-2n) - ( 5m – 2n ) ( 1 + 3y ), mx+3m-nx-3n - ( x + 3 ) ( m – n ), 93m3 x2 y-62m2 x3 y2-124m2 x - 31m2x (3mxy – 2x2y2 – 4 ), 55m2 n3 x+110m2 n3 x2- 220m2 y3 - 55m2 (n3x + 2n3x2 – 4y3), r(c-2)-c+2 - ( c – 2 ) ( r – 1 ), x(b+2)-b-2+3(b+2) - ( b + 2 ) ( x – 1 + 3 ), (a+3)(b+1) - b - 1 - ( b + 1 ) ( a + 2 ), k(q+r)-b(q+r)-q-r - ( q + r ) ( k – b – 1 ), p(h-1)+w(-h-1)+(h-1) - ( h – 1 ) ( p – w + 1 ), m8/16-n12 - (m4/4+n6)(m4/4-n6), n6/49-1/121 - (n3/7-1/11)(n3/7+1/11), (m+1)2-36 - ( m – 5 ) ( m + 7), a2-169 - ( a - 13 ) ( a + 13 ),

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