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4x+5x=20
We simplify the equation to the form, which is simple to understand
4x+5x=20
We move all terms containing x to the left and all other terms to the right.
+4x+5x=+20
We simplify left and right side of the equation.
+9x=+20
We divide both sides of the equation by 9 to get x.
x=2.22222222222
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