-(2,1а-1,3у)+(2,5у-0,8а)-(-1,2а+2,у) = -2,1a+1,3y+2,5y-0,8a+1,2a-2y = -2,1a -0,8a+1,2a+1,3y+2,5y-2y = 1,8y-1,7a
-(2,1а - 1,3у) + (2,5у - 0,8а) - (-1,2а + 2у) = -2,1a + 1,3y + 2,5y - 0,8a + 1,2a - 2y = a(-2,1 - 0,8 + 1,2) + y(1,3 + 2,5 - 2) = -1,7a + 1,8y
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-(2,1а-1,3у)+(2,5у-0,8а)-(-1,2а+2,у) = -2,1a+1,3y+2,5y-0,8a+1,2a-2y = -2,1a -0,8a+1,2a+1,3y+2,5y-2y = 1,8y-1,7a
-(2,1а - 1,3у) + (2,5у - 0,8а) - (-1,2а + 2у) = -2,1a + 1,3y + 2,5y - 0,8a + 1,2a - 2y = a(-2,1 - 0,8 + 1,2) + y(1,3 + 2,5 - 2) = -1,7a + 1,8y