21 :)
x 8
------
168
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7x/8 = 21 so 7x = 21*8 x = 12*8/7 = 3*8 = 24
Because 8 x 21 = 168
If: -3*(x+8) = -21 Then: x = -1
First set up a proprotion 21 over 8 = x over 100. then cross multiply to get ... 2100 = 8x , then divide both sides by 8 to get 262.5 = x
maybe eight 21 - 5 = 16 = 2 x 8