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x-.4(x)=225
We simplify the equation to the form, which is simple to understand
x-.4(x)=225
Reorder the terms in parentheses
x+(-0.4x)=225
Remove unnecessary parentheses
+x-0.4x=+225
We move all terms containing x to the left and all other terms to the right.
+1x-0.4x=+225
We simplify left and right side of the equation.
+ 0.6x=+225
We divide both sides of the equation by 0.6 to get x.
x=375
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