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-7a+3b-2a-b= - 7a - 2a +3b-b
3,5x -2y-3y+7-=3.5x +1y+7
3i 3/5 az -1 i 1/5z + 5za - za= niewiem ;/
3.5x-5y+7
3 3/5 - 1 1/5 +4za