Первое уравнение должно быть 3 росписи

[latex]1)x-5 \frac{17}{60} =7\frac{9}{20} \\ x=7\frac{9}{20}+5 \frac{17}{60}= \frac{149}{20} + \frac{317}{60} = \frac{447}{60} + \frac{317}{60}= \frac{764}{60} =12 \frac{11}{15} \\ 2)(x- \frac{11}{30} )- \frac{16}{45} = \frac{2}{9} \\ x= \frac{2}{9}+\frac{11}{30}+\frac{16}{45}=\frac{20}{90}+\frac{33}{90}+\frac{32}{90}= \frac{85}{90} = \frac{17}{18} [/latex]

x-5 17/60=7 9/20 x=5 17/60+7 9/20 x=5 17/60+7 27/60 x=12 44/60 ---------------------------- 12 44/60-5 17/60=7 9/20 7 9/20=7 9/20 Ответ: x= 12 44/60