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4x+9+5x=12
We simplify the equation to the form, which is simple to understand
4x+9+5x=12
We move all terms containing x to the left and all other terms to the right.
+4x+5x=+12-9
We simplify left and right side of the equation.
+9x=+3
We divide both sides of the equation by 9 to get x.
x=0.33333333333333
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