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13+2x=3x+9
We simplify the equation to the form, which is simple to understand
13+2x=3x+9
We move all terms containing x to the left and all other terms to the right.
+2x-3x=+9-13
We simplify left and right side of the equation.
-1x=-4
We divide both sides of the equation by -1 to get x.
x=4
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