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2x+z=3+y
Add y to both sides.
2x=3+y-z
Subtract z from both sides.
2x=y-z+3
The equation is in standard form.
\frac{2x}{2}=\frac{y-z+3}{2}
Divide both sides by 2.
x=\frac{y-z+3}{2}
Dividing by 2 undoes the multiplication by 2.
-y+z=3-2x
Subtract 2x from both sides.
-y=3-2x-z
Subtract z from both sides.
-y=3-z-2x
The equation is in standard form.
\frac{-y}{-1}=\frac{3-z-2x}{-1}
Divide both sides by -1.
y=\frac{3-z-2x}{-1}
Dividing by -1 undoes the multiplication by -1.
y=2x+z-3
Divide 3-2x-z by -1.