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3x+20=4x+13
We simplify the equation to the form, which is simple to understand
3x+20=4x+13
We move all terms containing x to the left and all other terms to the right.
+3x-4x=+13-20
We simplify left and right side of the equation.
-1x=-7
We divide both sides of the equation by -1 to get x.
x=7
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