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4(9-x)/(5)=x
We simplify the equation to the form, which is simple to understand
4(9-x)/(5)=x
Reorder the terms in parentheses
dividing of parentheses
4*(+1.8-0.2x)=x
Reorder the terms in parentheses
+(+7.2-0.8x)=x
Remove unnecessary parentheses
+7.2-0.8x=+x
We move all terms containing x to the left and all other terms to the right.
-0.8x-1x=-7.2
We simplify left and right side of the equation.
-1.8x=-7.2
We divide both sides of the equation by -1.8 to get x.
x=4
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