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b. -3(a - 2b) = -3a + 6b
catatan :
> perkalian mines dngn mines menghasilkn positif
= (2 × x) + (2 × 4)
= 2x + 8
b. -3(a - 2b)
= (-3 × a) + (-3 × -2b)
=-3a + 6b