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x-13-4x =-12
We simplify the equation to the form, which is simple to understand
x-13-4x=-12
We move all terms containing x to the left and all other terms to the right.
+1x-4x=-12+13
We simplify left and right side of the equation.
-3x=+1
We divide both sides of the equation by -3 to get x.
x=-0.33333333333333
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