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(2x+9)=90
We simplify the equation to the form, which is simple to understand
(2x+9)=90
Remove unnecessary parentheses
2x+9=90
We move all terms containing x to the left and all other terms to the right.
+2x=+90-9
We simplify left and right side of the equation.
+2x=+81
We divide both sides of the equation by 2 to get x.
x=40.5
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