x-21 = -10
x = -10+21
Solve for x...
-10+21= x
x=11
Plug 11 into original equation and see for yourself!
Dana from USM in MS.
x = 11
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21x21 equals 7x7x9
10 percent of 100 equals 10.
10 squared equals 100. 102 = 10*10 10*10 = 100
7 out of 10 equals 70%
transitive property