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45.90=x+4x
We simplify the equation to the form, which is simple to understand
45.90=x+4x
We move all terms containing x to the left and all other terms to the right.
-1x-4x=-45.9
We simplify left and right side of the equation.
-5x=-45.9
We divide both sides of the equation by -5 to get x.
x=9.18
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