Giải:
a) \(\dfrac{3}{-5}=2.\dfrac{x-2}{15}\)
\(\Leftrightarrow\dfrac{-3}{5}=\dfrac{2\left(x-2\right)}{15}\)
\(\Leftrightarrow-3.15=5.2\left(x-2\right)\)
\(\Leftrightarrow-45=10x-20\)
\(\Leftrightarrow-45+20=10x\)
\(\Leftrightarrow-25=10x\)
\(\Leftrightarrow x=-\dfrac{25}{10}=-\dfrac{5}{2}\)
Vậy ...
b) \(\dfrac{2\left(x-2\right)}{5}=\dfrac{3\left(2-3x\right)}{7}\)
\(\Leftrightarrow2.7\left(x-2\right)=5.3\left(2-3x\right)\)
\(\Leftrightarrow14\left(x-2\right)=15\left(2-3x\right)\)
\(\Leftrightarrow14x-28=30-45x\)
\(\Leftrightarrow14x+45x=30+28\)
\(\Leftrightarrow59x=58\)
\(\Leftrightarrow x=\dfrac{58}{59}\)
Vậy ...
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