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7-51.

Solve for the variable by isolating it on one side.

−3y = 12 − 6x

Now divide both sides by −3.

Follow the steps outlined in part (a).

First distribute to remove the parenthesis, then combine like terms. To finish, follow steps in part (a).

x = 1

Multiply by a common denominator to remove the fractions. Then follow the steps in part (a).