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40-1/5(90)=0
We simplify the equation to the form, which is simple to understand
40-1/5(90)=0
Simplifying:
40-0.2*(90)=0
Reorder the terms in parentheses
40+(-18)=0
Remove unnecessary parentheses
+40-18=0
We move all terms containing to the left and all other terms to the right.
0=0-40+18
We simplify left and right side of the equation.
0=-22
0=-22
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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