Question

\(25\%\cdot x+x=-1,25\)

\(75\%\cdot x+x:\dfrac{4}{5}=-2010\)

\(25\%\cdot x+0,5\cdot x-\dfrac{x}{3}=-26\)

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Answer 1

a) \(25\%x+x=-1,25\\ < =>\dfrac{125}{100}x=-1,25\\ =>x=\dfrac{-1,25}{125}=-0,01\)

b) \(75\%x+x:\dfrac{4}{5}=-2010\\ < =>\dfrac{75}{100}x+\dfrac{5}{4}x=-2010\\ < =>\dfrac{75}{100}x+\dfrac{125}{100}x=-2010\\ < =>2x=-2010\\ =>x=\dfrac{-2010}{2}=-1005\)

c) \(25\%x+0,5x-\dfrac{x}{3}=-26\\ < =>\dfrac{1}{4}x+\dfrac{1}{2}x-\dfrac{1}{3}x=-26\\ < =>\dfrac{5}{12}x=-26\\ =>x=\dfrac{-26}{\dfrac{5}{12}}=-62\dfrac{2}{5}\)