\(91-5.\left(5+x\right)=61\\ \Rightarrow5.\left(5+x\right)=91-61=30\\ \Rightarrow5+x=\dfrac{30}{5}=6\\ \Rightarrow x=6-5=1\)
\(\left[195-\left(3x-27\right)\right].39=4212\\ \Rightarrow195-3x+27=\dfrac{4212}{39}=108\\ \Rightarrow222-3x=108\\ \Rightarrow3x=222-108=114\\ \Rightarrow x=\dfrac{114}{3}=38\)
91-5.(5+x)=61
<=>91-25-5x=61
<=>66-5x=61
<=-5x=-5
<=>x=1
\(91-5.\left(5+x\right)=61\)
\(5.\left(5+x\right)=91-61\)
\(5.\left(5+x\right)=30\)
\(5+x=30\div5\)
\(5+x=6\)
\(x=6-5\)
\(x=1\)
\(\left[195-\left(3x-27\right)\right].39=4212\)
\(\left[195-\left(3x-27\right)\right]=4212\div39\)
\(195-\left(3x-27\right)=108\)
\(3x-27=195-108\)
\(3x-27=87\)
\(3x=87+27\)
\(3x=114\)
\(x=114\div3\)
\(x=38\)
