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* a + 5 = 2a - 1
a = 6
* b + 2 = 3a
b = 3 (6) -2
= 18 -2 = 16
menurutku kaya gitu, kalo ada kesalahan maaf yaa :)
*a
a + 5 = 2a - 1
a + 5 (+1) = 2a - 1 (+1)
a + 6 = 2a
a + 6 (-a) = 2a (-a)
6 = a
*b
b + 2 = 3a
b + 2 = 3(6)
b + 2 = 18
b + 2 (-2) = 18 (-2)
b = 16
Jadi kesimpulannya "b = 16"
Semoga cara saya diatas dapat dimengerti :)