a) \(56-\left(x+31\right)=12\)
\(\Rightarrow x+31=44\)
\(\Rightarrow x=13\)
b) \(\left(2x+5\right)\cdot4=6^2\)
\(\Rightarrow2x+5=9\)
\(\Rightarrow2x=4\)
\(\Rightarrow x=2\)
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a) 56 - ( x+31) = 12
\(\Rightarrow\) -x + 25 = 12
\(\Rightarrow\) -x = -13
\(\Rightarrow\) x = 13
b) ( 2x +5 ) . 4=62
\(\Leftrightarrow\) (2x + 5) . 4 = 36
\(\Rightarrow\) 2x + 5 = 9
\(\Rightarrow\) 2x = 4
\(\Rightarrow\) x = 2
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