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3a - 7a= -8 - 12
-4a= -20
a= -20/-4
a= 5
maka :
a + 2
5 + 2
7
Jadi, hasilnya adalah 7.
3a-7a=-8-12
-4a=-20
4a=20
a=20/4
a=5
a+2=5+2=7