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1. 17+2x2-5+26-3x2+21=
2. 28+7x2-3x2+72-2x4+4x2=
3. 48-7x2+12-8x2+25=
4. 6x2-2x2=
5. 2x8-2x6=
6. 7x2-1x2=
7. 4x2+7x2=
8. 9x2+2x2+7x2-8X2=​