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13x-21=10x+12
We simplify the equation to the form, which is simple to understand
13x-21=10x+12
We move all terms containing x to the left and all other terms to the right.
+13x-10x=+12+21
We simplify left and right side of the equation.
+3x=+33
We divide both sides of the equation by 3 to get x.
x=11
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