8100 plus 90 plus 72 is equal to 8,262.
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The square roots of 8100 are 90, -90
72 + 18 = 90
90+x+72+30 = 180. If you add 90+72+30, you get 192. But to get 180 you have to subtract 12. 90+(-12)+72+30 =180 if x is -12
90*90 = 8100
90 x 90 = 8100