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3.x-16=y
x+y=12
x=16+y
16+y+y=12
2y=12-16
2y= -4
y=-2
x=16+(-2)
x= 14
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3.x-16=y
x+y=12
x=16+y
16+y+y=12
x=16+y
2y=12-16
x=16+y
2y= -4
x=16+y
y=-2
x=16+(-2)
y=-2
x= 14
y=-2