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8x+20x+9=0
We simplify the equation to the form, which is simple to understand
8x+20x+9=0
We move all terms containing x to the left and all other terms to the right.
+8x+20x=0-9
We simplify left and right side of the equation.
+28x=-9
We divide both sides of the equation by 28 to get x.
x=-0.32142857142857
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