a) \(-x+\dfrac{7}{4}=\dfrac{6}{5}-\dfrac{3}{4}\)
\(\Rightarrow-x=\dfrac{6}{5}-\dfrac{3}{4}-\dfrac{7}{4}\)
\(\Rightarrow-x=-\dfrac{13}{10}\)
\(\Rightarrow x=\dfrac{13}{10}\)
b) \(0,7^2\cdot x=0,49^3\)
\(\Rightarrow0,7^2\cdot x=\left[\left(0,7\right)^2\right]^3\)
\(\Rightarrow0,7^2\cdot x=0,7^6\)
\(\Rightarrow x=0,7^6:0,7^2=0,7^4\)
c) \(\dfrac{2}{3}:x=1,4-\dfrac{12}{5}\)
\(\Rightarrow\dfrac{2}{3}:x=-1\)
\(\Rightarrow x=\dfrac{2}{3}:-1\)
\(\Rightarrow x=-\dfrac{2}{3}\)
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