"x" is a lot simpler than "the number which I don't know but am trying to calculate"
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Yes and it is z=x+iy
A number is cubed if it is multiplied by itself three times. e.g. x^3 = x*x*x
The number plus sevenIf the "number" is X, then seven more than X is X+7
X represents the number '10'
MMM = 3000 but for higher numbers of thousand a horizontal bar is placed above the required number to denote that it is x 1000 or the number can be placed in brackets which also denotes x 1000. I can't do the horizontal line with my keyboard so 11,000 is (XI) which means 11 x 1000.