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4(5x+9)=-84
We simplify the equation to the form, which is simple to understand
4(5x+9)=-84
Reorder the terms in parentheses
+(+20x+36)=-84
Remove unnecessary parentheses
+20x+36=-84
We move all terms containing x to the left and all other terms to the right.
+20x=-84-36
We simplify left and right side of the equation.
+20x=-120
We divide both sides of the equation by 20 to get x.
x=-6
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