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2x+x=13
We simplify the equation to the form, which is simple to understand
2x+x=13
We move all terms containing x to the left and all other terms to the right.
+2x+1x=+13
We simplify left and right side of the equation.
+3x=+13
We divide both sides of the equation by 3 to get x.
x=4.33333333333
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