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13x-4=8x+21
We simplify the equation to the form, which is simple to understand
13x-4=8x+21
We move all terms containing x to the left and all other terms to the right.
+13x-8x=+21+4
We simplify left and right side of the equation.
+5x=+25
We divide both sides of the equation by 5 to get x.
x=5
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