Simplify the expression by combining like terms, if possible.
+ 
A. 
x - 
B. 
x + 
C. 
x - 
D. 
x - 
Answer: C
Mathematics
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A. -7i
B. ±7
C. 7i
D. i
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A. ?RST, ?SRT B. ?RzS, ?SzR C. ?PTQ, ?QTP D. ?RTS, ?STR
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A. [3, ?)
B. (-3, 3)
C. (-?, -3) ? (3, ?)
D. [-3, 3]
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