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

First step: Adding 4 on both sides of the given equation.

(9 x – 4) + 4 = 50 + 4.

This gives 9 x = 54.

Now dividing both sided of the equation by 9.

This gives 9 x/ 9 = 54 / 9.

This reduces the given equation to x = 6.

Hence the solution is x = 6.

Here the variable is x; distributing the number in front of the braces.

This gives 4 (x - 3) = 4x – 12; 5 (x + 2) = 5x + 10.

Combining the similar terms in the equation.

This gives 4x – 12 + 5x + 10 + 2 = 9x + 2 -2 = 9x

Hence the simplified form of the equation is 9x.