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3(40+20)=60
We simplify the equation to the form, which is simple to understand
3(40+20)=60
Simplifying terms in parentheses
3*(+60)=60
Reorder the terms in parentheses
+(+180)=60
Remove unnecessary parentheses
+180=+60
We move all terms containing to the left and all other terms to the right.
0=+60-180
We simplify left and right side of the equation.
0=-120
0=-120
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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