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13x+4=12x-5
We simplify the equation to the form, which is simple to understand
13x+4=12x-5
We move all terms containing x to the left and all other terms to the right.
+13x-12x=-5-4
We simplify left and right side of the equation.
+1x=-9
We divide both sides of the equation by 1 to get x.
x=-9
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