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x+21=3x+3
We simplify the equation to the form, which is simple to understand
x+21=3x+3
We move all terms containing x to the left and all other terms to the right.
+1x-3x=+3-21
We simplify left and right side of the equation.
-2x=-18
We divide both sides of the equation by -2 to get x.
x=9
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