Question 301011

Decide which side you want to be negative (not that it matters)
I'll have the variable side negative, so
Subtract 7K from each side:
{{{ 3K - 7K -5=7K - 7K +7 }}}<br>
Now we have:
-4K - 5 = 7<br>
Add 5 to each side, giving us:
-4K = 12 <br>
Now, divide each side by -4:
{{{ cross(-4)K/cross(-4) = cross(12 / -4) -3  }}}<br>
So the answer is K = -3 
& bob's your uncle!