<PRE><B>Question 1078177</B>
20/(12-x) = 49/(12+x)
12-x/20 = 12+x/49
3/5-x/20 = x/49+12/49
subtract x/49+3/5 from both sides:
-69x/980 = -87/245
multiply both sides times 980/60
x = 116/23 = 5.04
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Check:
20/12-5.04 = 49/12+5.04
20/6.96 = 49/17.04 Use your calculator to see that the answer is correct.</PRE>