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[latex]\frac{2\frac{2}{7}*(-2,6)*3,5}{4}=\frac{\frac{4}{13}*(-3,9)*3,25}{x}\\\\\frac{\frac{16}{7}*(-\frac{13}{5})*\frac{7}{2}}{4}=\frac{\frac{4}{13}*(-\frac{39}{10})*\frac{13}{4}}{x}\\\\\frac{\frac{16*(-13)*7}{7*5*2}}{4}=\frac{\frac{4*(-39)*13}{13*10*4}}{x}\\\\\frac{\frac{-104}{5}}{4}=\frac{\frac{-39}{10}}{x}\\\\\frac{-104}{5*4}=\frac{-39}{10*x}\\\\-104*10x=5*4*(-39)\\-1040x=-780\\x=\frac{-780}{-1040}\\\\x=\frac{3}{4}ilix=0,75 [/latex]