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2.A={1,2,3,4,5}
B={1,2,3,4,6.12}
AnB={1,2,3,4}
3.(3a-2)x(a+5)=3a^2+15a-2a-10
=3a^2+13a-10
4.4x=24+12
4x=36
x = 9
5.3x-x<15+7
2x<22
x < 11 (bilangan prima)
x = 11 (bilangan prima)