5(x+y-z)+5(x-z)-5y=10(x-z)
5x + 5y - 5z + 5x - 5z - 5y = 10(x-z)
приведем подобные
10x - 10z = 10(x-z)
10(x-z) = 10(x-z)
5(x+y-z)+5(x-z)-5y=10(x-z)
5x + 5y - 5z + 5x - 5z - 5y = 10(x-z)
приведем подобные
10x - 10z = 10(x-z)
10(x-z) = 10(x-z)