\(5-\left(2x+3\right)=125\)
\(\Rightarrow5-2x-3=125\)
\(\Rightarrow2x=2-125=-123\)
\(\Rightarrow x=-\dfrac{123}{2}\)
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\(5-\left(2x+3\right)=125\)
\(\Rightarrow5-2x-3=125\)
\(\Rightarrow2x=2-125\)
\(\Rightarrow2x=-123\)
\(\Rightarrow x=-123:2\)
\(\Rightarrow x=\dfrac{-123}{2}\)