X - 1 is not null => x is not 1 => D = R - {1};
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Answer:
x+15
Step-by-step explanation:
X stands for the number of cards the one person represent add 15 to the whatever number of cards you have.
First you need to multiply the number on the outside of the parentheses to what's inside. Then you need to subtract 1440 from both sides. After that you need to get all of the u's on one side so you subtract 256u from -160u and then you divide 832 by 96.