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3x-5+21=13
We simplify the equation to the form, which is simple to understand
3x-5+21=13
We move all terms containing x to the left and all other terms to the right.
+3x=+13+5-21
We simplify left and right side of the equation.
+3x=-3
We divide both sides of the equation by 3 to get x.
x=-1
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