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6x+21=8x+13
We simplify the equation to the form, which is simple to understand
6x+21=8x+13
We move all terms containing x to the left and all other terms to the right.
+6x-8x=+13-21
We simplify left and right side of the equation.
-2x=-8
We divide both sides of the equation by -2 to get x.
x=4
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