-3a-3b+2a-2b= -a-5b
2m-8n-4m+8n= -2m
5x-25-6x+27= 2-x
2y²-y²+3y+2y-y²= 5y
-2x+18+5x-20=25
3x=27
x= 9
20-4n-6n-21=0
-10n=1
n= -0,1
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-3a-3b+2a-2b= -a-5b
2m-8n-4m+8n= -2m
5x-25-6x+27= 2-x
2y²-y²+3y+2y-y²= 5y
-2x+18+5x-20=25
3x=27
x= 9
20-4n-6n-21=0
-10n=1
n= -0,1