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⇔ a = 4 - 2
⇔ a = 2
2) 3 x b = 9
⇔ b = 9 / 3
⇔ b = 3
3) 25 : c = 50
⇔ 50 x c = 25
⇔ c = 25 / 50
⇔ c = 1 / 2 atau 0,5
4) 4a x a = 8
⇔ = 8
⇔ = 8 / 4
⇔ = 2
⇔ a =
5) 2a + 4 = 2a + 8
⇔ 2a - 2a = 8 - 4
⇔ 0
maaf, saya kurang yakin sama jawaban nomor 5.
semoga membantu.