Помогите номер 997.По быстрому!Даю 30 баллов

[latex]1)\;\frac58x-\left(\frac14x-\frac1{12}y\right)+\frac13y=\frac58x-\frac14x+\frac1{12}y+\frac13y=\\=\frac58x-\frac28x+\frac1{12}y+\frac4{12}y=\frac38x+\frac5{12}y\\2)\;9,4x+\left(2x-11\frac34y\right)-3\frac59y=9,4x+2x-11\frac34y-3\frac59y=\\=11,4x-11\frac{27}{36}y-3\frac{20}{36}y=11,4x-14\frac{47}{36}y=11,4x-15\frac{11}{36}y\\3)\;2\frac16x-\left(7x-1\frac34y\right)+2\frac14y=2\frac16x-7x+1\frac34y+2\frac14y=\\=-4\frac56x+4y[/latex] [latex]4)\;3,5x+\left(6\frac14x-7y\right)-7y=3\frac12x+6\frac14x-7y-7y=\\=3\frac34x+6\frac14x-14y=10x-14y[/latex]