how do I get the answer 2/7 for 3(14-u)/8= -3u+6?

Algebra, solving equaions that have division, multiplication, adding and subtracting.  I I dont know how to get 2/7 for an answer, I have 116/269.
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1 Answer

(3/8)(14-x)=-3x+6

3(14-x)=-24x+48

-3x +24x +42=48

21x=6

x=6/21

x=2/7
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