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15 x (45-10) = 45 x 5 -10
675 - 150 = 225 - 10
525 = 215
soal B ( udah bener )
- 45 x (5-20)= (-45x5) - (-45x20)
-225 + 900 = -225 - ( - 900)
-225 +900 = -225 + 900
675 = 675