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4x+5x=22.5
We simplify the equation to the form, which is simple to understand
4x+5x=22.5
We move all terms containing x to the left and all other terms to the right.
+4x+5x=+22.5
We simplify left and right side of the equation.
+9x=+22.5
We divide both sides of the equation by 9 to get x.
x=2.5
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