Решить систему уравнения y/2-x+y/5=0,1 и y/5-x-y/2=0,1

Y/2 - x + y/5 = 0.1
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y/5 - x - y/2 = 0.1
y/2 - y/5 - x - (-x) + y/5 - (-y/2) = 0.1 - 0.1
5y/10 - 2y/10 + 2y/10 + 5y/10 = 0
5y/10 + 5y/10 = 0
10y/10 = 0
 y = 0
0 - x + 0 = 0.1
0 - x - 0 = 0.1
x = -0.1
y = 0