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2( 6a+10)=4(3a + 2,5)
5(4n+6k)=10( 2n + 3k)
2(6a+10)=4(3a+5)
5(4n+6k)=10(2n+3k)
2(6a+10)=4({3}a+{5})
5(4n+6k)=10({2}n+{3})