a: =>x+3/5=5/6-13/20=50/60-39/60=11/60
=>x=11/60-36/60=-25/60=-5/12
b: =>1/3:x=3/5-2/3=9/15-10/15=-1/15
=>x=-1/3:1/15=-5
c: \(\Leftrightarrow x\cdot\dfrac{2}{3}-3=\dfrac{2}{5}\cdot\left(-10\right)=-4\)
=>2/3x=-1
=>x=-3/2
d: \(\Leftrightarrow\left[{}\begin{matrix}x+5=8\\x+5=-8\end{matrix}\right.\Leftrightarrow x\in\left\{3;-13\right\}\)
g: =>2x-3=3 hoặc 2x-3=-3
=>2x=0 hoặc 2x=6
=>x=3 hoặc x=0
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