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Here the unknown variable which needs to be solved for is x.

First step: Distribute 2 on one side of the equation.

This gives, (2x – 4) = 15.

Add 4 on both sides of the equation: 2x = 19.

Now dividing both sided of the equation by 2.

This gives 2x/2 = 19/2.

This reduces the given equation to x = 19/2.

Here the unknown variable which needs to be solved for is x.

First step: Add 1 on both sides and distribute 3 to (x - 1) in the equation.

This gives, (3x – 3) = 27.

Add 3 on both sides of the equation: 3x = 30.

Now dividing both sided of the equation by 3.

This gives 3x/3 = 30/3.

This reduces the given equation to x = 30/3.