a: \(\Leftrightarrow\dfrac{-3}{x-1}=\dfrac{y-2}{8}=\dfrac{-3}{4}\)
=>x-1=4; y-2=-6
=>x=5; y=-4
b: \(\Leftrightarrow5\left(x+5\right)=4\left(x-3\right)\)
=>5x+25=4x-12
=>x=-37
c: \(\Leftrightarrow\left(-\dfrac{3}{5}x-\dfrac{1}{2}\right)\cdot\dfrac{3}{4}=\dfrac{1}{3}-1=-\dfrac{2}{3}\)
\(\Leftrightarrow-\dfrac{3}{5}x-\dfrac{1}{2}=\dfrac{-2}{3}:\dfrac{3}{4}=\dfrac{-8}{9}\)
=>-3/5x=-7/18
hay x=35/54
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