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21x-3x=9
We simplify the equation to the form, which is simple to understand
21x-3x=9
We move all terms containing x to the left and all other terms to the right.
+21x-3x=+9
We simplify left and right side of the equation.
+18x=+9
We divide both sides of the equation by 18 to get x.
x=0.5
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