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90=9x+20
We simplify the equation to the form, which is simple to understand
90=9x+20
We move all terms containing x to the left and all other terms to the right.
-9x=+20-90
We simplify left and right side of the equation.
-9x=-70
We divide both sides of the equation by -09 to get x.
x=7.77777777778
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