Reduce the following algebraic expressions by grouping like terms:
- -4x +6 +7 x-11-9x-3x +5 +13 +6 x-8 x =
- 6x-3y -xx-and y-4x +7 y-9x + y + x +8 +4 y-3x = 9x
- -5-11x-7 +3 x +2-7 x-x +1- x +2 + x +5-2 8x =
- -3 +2 x + x-9-6x-1-x-x +5 +4 x-7 + x-3x =
- 2x-3y-5x-5y + x +4 y + xy-2x-2y +6 x-9x-8y =
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