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2x=(10-4y)
2x=(-4y+10)
X=(-4y+10)/2
X=(-2y+5)
2)3x-y=1
3x=(1+y)
2x=(y+1)
x=(y+1)/2
=(y+1)
3)3x+2y=13
3x=13-2y
3x=(-2y+13)
x=(-2y+13)/3