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13=x-3+3x
We simplify the equation to the form, which is simple to understand
13=x-3+3x
We move all terms containing x to the left and all other terms to the right.
-1x-3x=-3-13
We simplify left and right side of the equation.
-4x=-16
We divide both sides of the equation by -4 to get x.
x=4
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