12x - 9x = 6
3x = 6
x = ?
12x - 6 = 9x
Subtract 9x from both sides.
3x -6 = 0
3x = 6
I assume you can carry on from there.
first step: subtract x-variables to one-side of the equation
second step: divide -3 to the other side to get the value of x
x=2 (final answer)
Lastly, you can check your answer of x=2 by plugging it into the original equation to see if both sides of the equation are equal.
Therefore x=2 is correct
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