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4x+5(x+4)=0
We simplify the equation to the form, which is simple to understand
4x+5(x+4)=0
Reorder the terms in parentheses
4x+(+5x+20)=0
Remove unnecessary parentheses
+4x+5x+20=0
We move all terms containing x to the left and all other terms to the right.
+4x+5x=0-20
We simplify left and right side of the equation.
+9x=-20
We divide both sides of the equation by 9 to get x.
x=-2.2222222222222
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