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-3a=15a-45
45=15a+3a
45=18a
a=2,5
hp:{a|a=2,5}
- 3a = 15a - 45
-3a - 15a = - 45
-18a = - 45
a = -45/-18 atau 45/18
a = 2,5
HP = {( 2,5 )}