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B) 6=2x ⇒ 6÷2=x ⇒ 3=x
C) 5x=40 ⇒ x=40÷5 ⇒ x=8
D) x+(9·7)=(10·7) ⇒ x+63=70 ⇒ x=70-63 ⇒ x=7
E) 2x=12-4 ⇒ x=8÷2 ⇒ x=4