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2a+5a-3a=4a
3b+2b-5b=0
3b+8b=11b
17x-9x=8x
4y+(-3y)=y
8z-15z=-7z
6x-2x+1½x=5,5x
5t-7t+(2,5t) =0,5t
4a
0b
11b
8x
-
-7z
91/2x
-
2a+5a-3a=7a-3a=4a
3b+2b-5b=5b-5b=0
3b+8b=11b
17x-9x=8x
4y+(-3y)=4y-3y=y
8z-15z=(-7z)
6x-2x+1½x=7½x-2x=5½x
5t-7t+(2,5t)= 7,5t-7t=0,5t