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9=16x+12x-7
We simplify the equation to the form, which is simple to understand
9=16x+12x-7
We move all terms containing x to the left and all other terms to the right.
-16x-12x=-7-9
We simplify left and right side of the equation.
-28x=-16
We divide both sides of the equation by -28 to get x.
x=0.571428571429
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