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![y-[y-(2-y)+1]+4=-(3-y) \\ y-[y-2+y+1]+4=-3+y \\ y-[2y-1]+4=-3+y \\ y-2y+1+4=-3+y \\ \\ \not y-2y-\not y=-3-1-4 \\ -2y=-8 \\ 2y=8 \\ y=8\div2 \\ y=4](https://tex.z-dn.net/?f=y-%5By-%282-y%29%2B1%5D%2B4%3D-%283-y%29+%5C%5C+y-%5By-2%2By%2B1%5D%2B4%3D-3%2By+%5C%5C+y-%5B2y-1%5D%2B4%3D-3%2By+%5C%5C+y-2y%2B1%2B4%3D-3%2By+%5C%5C++%5C%5C+%5Cnot+y-2y-%5Cnot+y%3D-3-1-4+%5C%5C++-2y%3D-8+%5C%5C+2y%3D8+%5C%5C+y%3D8%5Cdiv2+%5C%5C+y%3D4 "y-[y-(2-y)+1]+4=-(3-y) \\ y-[y-2+y+1]+4=-3+y \\ y-[2y-1]+4=-3+y \\ y-2y+1+4=-3+y \\ \\ \not y-2y-\not y=-3-1-4 \\ -2y=-8 \\ 2y=8 \\ y=8\div2 \\ y=4")
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