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x(15+5)=390
We simplify the equation to the form, which is simple to understand
x(15+5)=390
Simplifying terms in parentheses
x*(+20)=390
Reorder the terms in parentheses
+(+20x)=390
Remove unnecessary parentheses
+20x=+390
We move all terms containing x to the left and all other terms to the right.
+20x=+390
We simplify left and right side of the equation.
+20x=+390
We divide both sides of the equation by 20 to get x.
x=19.5
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