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3x+x=2+10
4x=12
x=3
2.3x+1=x+9
3x-x=9-1
2x=8
x=4
=3x+x=2+10
=4x=12
x= 12/4
x=3
3x+1=x+9
3x-x=9-1
=2x=8
x=8/2
x=4
jadi x=3 dan x=4
maaf kalo salah, semoga membantu^_^