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21-12x=13
We simplify the equation to the form, which is simple to understand
21-12x=13
We move all terms containing x to the left and all other terms to the right.
-12x=+13-21
We simplify left and right side of the equation.
-12x=-8
We divide both sides of the equation by -12 to get x.
x=0.66666666666667
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