k = 10
3k = 30
When a number appears next to a variable (like "k") it usually means multiply the number times the variable.
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K= 18.666666
3k-5=7k+73k-7k=7+5-4k=12k=-3
It is: 4k-10+7-7k combines to -3k-3
K+1 is as simplified as it gets. Unless you find the value of K. You can't add a variable and number.
3k-1=k+2 2k=3 k=3/2=1.5