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9x+3x=9
We simplify the equation to the form, which is simple to understand
9x+3x=9
We move all terms containing x to the left and all other terms to the right.
+9x+3x=+9
We simplify left and right side of the equation.
+12x=+9
We divide both sides of the equation by 12 to get x.
x=0.75
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