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x+3x+9x=39
We simplify the equation to the form, which is simple to understand
x+3x+9x=39
We move all terms containing x to the left and all other terms to the right.
+1x+3x+9x=+39
We simplify left and right side of the equation.
+13x=+39
We divide both sides of the equation by 13 to get x.
x=3
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