решите уравнение и выполните проверку;
5-х=1,7
4-y=-2 2/3
z+7/18=-2/3
z+0.4=-1 2/3

5-х=1,7х = 5 - 1,7х = 3,34-y=-2 2/3у = 4 + 2_2/3у = 6_2/3z+7/18=-2/3z = -2/3 - 7/18z = -12/18 - 7/18z = -19/18z = -1_1/18z+0.4=-1 2/3z = -1_2/3 - 0.4z = -5/3 - 4/10z = -50/30 - 12/30z = -62/30z = -2_2/30 = -2_1/15