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2x-y=1
a)x=-2-2y
2(-2-2y)-y=1
x=-2-2y
-4-4y-y=1
x=-2-2y
-5y=4+1
x=-2-2y
-5y=5 /-5
x=-2-2y
y= -1
y=-1
x=-2-2(-1)
y= -1
x=-2+2
y=-1
x=0