a) \(\dfrac{1}{4}+\dfrac{3}{4}x=\dfrac{3}{4}\)
\(\dfrac{3}{4}x=\dfrac{3}{4}-\dfrac{1}{4}\)
\(\dfrac{3}{4}x=\dfrac{2}{4}\)
x=\(\dfrac{2}{4}:\dfrac{3}{4}\)
x=\(\dfrac{2}{3}\)
b) \(-\dfrac{5}{7}-\left|\dfrac{1}{2}-x\right|=-\dfrac{11}{4}\)
\(\left|\dfrac{1}{2}-x\right|=-\dfrac{5}{7}+\dfrac{11}{4}\)
\(\left|\dfrac{1}{2}-x\right|=2\dfrac{1}{28}\)
=> \(\dfrac{1}{2}-x=2\dfrac{1}{28}\) hoặc\(\dfrac{1}{2}-x=-2\dfrac{1}{28}\)
=>x=\(-1\dfrac{15}{28}\) hoặc x=\(2\dfrac{15}{28}\)
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