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900=12(30+x)
We simplify the equation to the form, which is simple to understand
900=12(30+x)
Reorder the terms in parentheses
900=+(+360+12x)
Remove unnecessary parentheses
+900=+360+12x
We move all terms containing x to the left and all other terms to the right.
-12x=+360-900
We simplify left and right side of the equation.
-12x=-540
We divide both sides of the equation by -012 to get x.
x=45
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