\(200:25-\left(12-x\right)=4\\ 8-\left(12-x\right)=4\\ 12-x=8-4\\ 12-x=4\\ x=12-4\\ x=8\\ ---\\ \left(x-10\right).5=100-20.4\\ \left(x-10\right).5=100-80=20\\ x-10=\dfrac{20}{5}=4\\ x=4+10=14\)
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a)\(200:25-\left(12-x\right)=4\)
\(\Rightarrow8-\left(12-x\right)=4\)
\(\Rightarrow12-x=8-4\)
\(\Rightarrow12-x=4\)
\(\Rightarrow x=12-4\)
\(\Rightarrow x=8\)
b) \(\left(x-10\right)\cdot5=100-20\cdot4\)
\(\Rightarrow\left(x-10\right)\cdot5=100-80\)
\(\Rightarrow\left(x-10\right)\cdot5=20\)
\(\Rightarrow x-10=4\)
\(\Rightarrow x=10+4\)
\(\Rightarrow x=14\)
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