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7x-9x+x-4x=0
We simplify the equation to the form, which is simple to understand
7x-9x+x-4x=0
We move all terms containing x to the left and all other terms to the right.
+7x-9x+1x-4x=0
We simplify left and right side of the equation.
-5x=0
We divide both sides of the equation by -5 to get x.
x=-0
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