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23x-6x=17x
6x+17x=23x
b) [email protected]=3a
3a-(-9a)=3a+9a=12a
-9a+12a=3a
c) [email protected]=11b
4b-11b=-7b
4b-(-7b)=11b
d) @[email protected]=-9y - 4x
-4x-2x=-6x
-9y-(-5y)=-9y+5y=-4y
-4y+2x-5y+(-6x)=-9y-4x
e) [email protected][email protected]+8=-6m - 2n
3m+m=4m
-6m-4m=-10m
3m+m-2n+(-10m)+8=-6-2n
f) @[email protected]+5s+t=0
0-5s=-5s
0-(-8t)=0+8t=8t
8t-t=7t
-5s-7t-8t+5s+t=0