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6x = 12
x = 2
y = 5
x = 5y - 3
x = 3 - y
5y - 3 = 3 - y
5y + y = 3 + 3
6y = 6
y = 1
x = 2
4x+y=13
y=2x+1
4x+2x+1=13
y=2x+1
6x=12/6
y=2x+1
x=2
y=2*2+1
x=2
y=5
x=2
5y-x=3
x=3-y
5y-(3-y)=3
x=3-y
5y-3+y=3
x=3-y
4y=6/4
x=3-y
y=1 i1/2
x=1 i 1/2