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2 =-b
3 =14xy-5x+8y
4 =3x+6
5 =8a
6 =6x+2x²
7 =4x+1,2
8 =-4,5x²-3x+4
9 =2y-3,5
10 =-x²-1,6x-8
2). -2a+b-a-2b+3a= -1b
3). 15xy - 4x+8y-6x+5x-xy= -5x +8y +14xy
4). 4x+6-x= 6 + 3x
5). 6a-a+3a= 8a
6). 7x+x²-x+x²= 6x +2x²
7). 5x-0,8-x+2= 1,2 +4x
8). -x²-2x+4-x-3,5x²= 4 -4,5x² -3x
9). 3,5y+y-2,5y-3,5= -3,5 +2y
10). 0,4x+x-x²-8-3x= -8 -x² -1,6x