\(\frac{75}{20-x}=\frac{3}{2}.10\)
\(\frac{75}{20-x}=15\)
\(\Rightarrow\left(20-x\right).15=75\)
\(\Rightarrow20-x=75:15\)
\(\Rightarrow20-x=5\)
\(\Rightarrow x=15\)
vậy \(x=15\)
\(2013x-x=2013.2011+2013\)
\(2012x=2013\left(2011+1\right)\)
\(2012x=2013.2012\)
\(x=2013\)
vậy \(x=2013\)
\(\left(x-15\right).7=270:45\)
\(\left(x-15\right).7=6\)
\(x-15=\frac{6}{7}\)
\(x=\frac{6}{7}+15\)
\(x=\frac{111}{7}\)
vậy \(x=\frac{111}{7}\)
\(\left(x-15\right).7=169\)
\(x-15=\frac{169}{7}\)
\(x=\frac{169}{7}+15\)
\(x=\frac{274}{7}\)
vậy \(x=\frac{274}{7}\)
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