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a. 2x+3=9
2x=9-3
2x=6
x=3
b.4n+5=-11
4n=-11-5
4n=-16
n=-4
bawah
a.3x+4=2x+11
3x-2x=11-4
x=7
b.2x=3+5-x
3x=8
x=0,37
maaf kalau salah