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13x-28=21x-13
We simplify the equation to the form, which is simple to understand
13x-28=21x-13
We move all terms containing x to the left and all other terms to the right.
+13x-21x=-13+28
We simplify left and right side of the equation.
-8x=+15
We divide both sides of the equation by -8 to get x.
x=-1.875
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