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40=4x-x+4
We simplify the equation to the form, which is simple to understand
40=4x-x+4
We move all terms containing x to the left and all other terms to the right.
-4x+1x=+4-40
We simplify left and right side of the equation.
-3x=-36
We divide both sides of the equation by -3 to get x.
x=12
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