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

First step: Adding 10 on both sides of the given equation.

(5 x – 10) + 10 = 20 + 10.

This gives 5 x = 30.

Now dividing both sided of the equation by 5.

This gives 5 x/ 5 = 30 / 5.

This reduces the given equation to x = 6.

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

First step: Adding 7 on both sides of the given equation.

(9 y – 7) + 7 = 20 + 7.

This gives 9 y = 27.

Now dividing both sided of the equation by 9.

This gives 9 y/ 9 = 27 / 9.

This reduces the given equation to y = 3.