326=12m+6c+x The reason your x does not have a number is because it is unknown so in order to solve for x you need to get rid of the 12m+6c so in order to that you can divide it on both sides so you would get 326/12m+6c=x the divide your numbers 18.1=x but you cant have a tenth of a djembe drum so you would have to round up to 19.
This on is very easy go to my website so i can explain it better for you
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The first one is 2266.66666667
The second one is 200.333333333
Any dilation (by a factor not 1) will result in a non-congruent image.
Selections 1, 2, 3, and 5 involve dilations, so they "apply."