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12-4a+5b-7-(-5a)-4b-5
5a3 - 2a3+2a3-a3x-4a3
-(3x+3)-[-(5x-5)+(4x-4)]
4x2 y-2xy2+3xy+1\4x2 y +8yx-12y2 x
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12-4a+5b-7-(-5a)-4b-5 =1b+1a+0
5a3 - 2a3+2a3-a3x-4a3 =1a3 + a3x
-(3x+3)-[-(5x-5)+(4x-4)] = -3x-3 -[ -5x + 5 + 4x-4 ] = -3x-3+5x-5-4x+4 = -2x-4
4x2 y-2xy2+3xy+1\4x2 y +8yx-12y2 x = tego to nie wiem