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First, subtract the numbers on the left side of the equation.  This gives you a result of -7x.  So now you have

-7x = 3x + 6

Now subtract 3x from both sides to get all the variables on one side.   That gives you

-10x = 6

So then you...

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First, subtract the numbers on the left side of the equation.  This gives you a result of -7x.  So now you have

-7x = 3x + 6

Now subtract 3x from both sides to get all the variables on one side.   That gives you

-10x = 6

So then you have to divide both sides by -10.  That gives you

x = -.6

You can verify that this is the correct answer by plugging this value for x back into the original equation.  You will end up with the equation 4.2 = 4.2 which is, of course, true.  This shows that x = -.6

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