It is an expression that can be simplified to: 5x-6
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1x210 2x105 3x70 5x42 6x35 7x30 10x21 14x15 These all equal 210
That's easy, just half it. 420 divided by 2 (5 is half of 10) which equals 210. (1) To check my answer, I did... 42 x5 (5 x 2=10 (carry the one), then 5 x 4=20 + 1= 120) ---- 210