a) \(\left(x-3\right)-9\left(2x-7\right)=\dfrac{-16}{2}\)
\(\Rightarrow x-3-18x+63=-8\)
\(\Rightarrow x=4\)
b) \(-2\left(-1+x\right)+5\left(-2+x\right)=-14+x\)
\(\Rightarrow2+-2x-10+5x=-14+x\)
\(\Rightarrow x=-3\)
\(\left(x-3\right)-9.\left(2x-7\right)=-16:2\)
\(\Leftrightarrow\left(x-3\right)-9\left(2x-7\right)=-8\)
\(\Leftrightarrow x-3-18x+63=-8\)
\(\)\(\Leftrightarrow x-3-18x=-8-63\)
\(\Leftrightarrow-17x-3=-71\)
\(\Leftrightarrow-17x=-68\)
\(\Leftrightarrow x=-68:-17=4\)
\(-2\left(-1+x\right)+5\left(-2+x\right)=-14+x\)
\(\Leftrightarrow2-2x-10+5x=-14+x\)
\(\Leftrightarrow-8+3x=-14+x\)
\(\Leftrightarrow3x-x=-14-8\)
\(\Leftrightarrow2x=-6\Rightarrow x=-3\)
