x-3=7 can be expressed as 7+3=x, therefore x = 10
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7*3 = 21.
You may not be aware but you could have obtained the answer much more easily and quickly by using the calculator that comes as part of your computer.
252 28 x 9 7 x 4 x 3 x 3 7 x 2 x 2 x 3 x 3 or 252 12 x 21 3 x 4 x 7 x 3 3 x 2 x 2 x 7 x 3 or 252 14 x 42 7 x 2 x 21 x 2 7 x 2 x 7 x 3 x 2
okay if x-4=3 then x=7 bcause 4+3=x = 4+3=7 and 7-4=3!
5
A question of prime factors... The answer is 2 x 2 x 3 x 5 x 7 = 420 2 x 2 x 3 x 5 x 7 gives us a factor of 2... 2 x 2 x 3 x 5 x 7 and of 3... 2 x 2 x 3 x 5 x 7 and of 4... 2 x 2 x 3 x 5 x 7 and of 5... 2 x 2 x 3 x 5 x 7 and of 6... 2 x 2 x 3 x 5 x 7 and of 7.
lcm(3, 7, 15) = 105. 3 = 3 7 = 7 15 = 3 x 5 lcm = 3 x 5 x 7 = 105