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y=2x+7-2
Divide 4 by 2 to get 2.
y=2x+5
Subtract 2 from 7 to get 5.
2x+5=y
Swap sides so that all variable terms are on the left hand side.
2x=y-5
Subtract 5 from both sides.
\frac{2x}{2}=\frac{y-5}{2}
Divide both sides by 2.
x=\frac{y-5}{2}
Dividing by 2 undoes the multiplication by 2.
y=2x+7-2
Divide 4 by 2 to get 2.
y=2x+5
Subtract 2 from 7 to get 5.