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9+8x=2x+81
We simplify the equation to the form, which is simple to understand
9+8x=2x+81
We move all terms containing x to the left and all other terms to the right.
+8x-2x=+81-9
We simplify left and right side of the equation.
+6x=+72
We divide both sides of the equation by 6 to get x.
x=12
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