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x+1=2(1-y)
x/5=(1-2y/5)-2(y-2)
x=2-2y-1
x/5=(1-2y/5)-2(y-2)
x=1-2y
1-2y/5=(1-2y/5) -2y +4
x=1-2y
2y=4//:2
x=1-2y
y=2
x=1-2*2
y=2
x=1-4
y=2
x= -3