![\\ \frac{3*4}{7*4}=\boxed{ \frac{12}{28}} \ and \ \frac{1*7}{4*7}=\boxed{ \frac{7} {28}}. Subtract:[tex] \\ \frac{12}{28}- \frac{7}{28}=\boxed{ \frac{5}{28}}](/tpl/images/0194/3006/fac96.png)
Now we have 5/28y=1/2.
Subtract both sides from 1/2.
y=
3/7-1/4y=1/2
(those are fractions by the way)...
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