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3x+21=67
We simplify the equation to the form, which is simple to understand
3x+21=67
We move all terms containing x to the left and all other terms to the right.
+3x=+67-21
We simplify left and right side of the equation.
+3x=+46
We divide both sides of the equation by 3 to get x.
x=15.3333333333
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