a)x+8=9
x=9+8
x=17
b)7x-9=12
7x=21
x=3
c)2x+3x=20
5x=20
x=4
d)4x-5=x+4.
3x=9
e)x+x.
2x
f)3x-1=2x+8
x=8+1
x=9
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a)x+8=9
x=9+8
x=17
b)7x-9=12
7x=21
x=3
c)2x+3x=20
5x=20
x=4
d)4x-5=x+4.
3x=9
x=3
e)x+x.
2x
f)3x-1=2x+8
x=8+1
x=9