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5(4r+7)=20(r+9)-7
We simplify the equation to the form, which is simple to understand
5(4r+7)=20(r+9)-7
Reorder the terms in parentheses
+(+20r+35)=20*(r+9)-7
Remove unnecessary parentheses
+20r+35=+20+*(+r+9+)-7
Reorder the terms in parentheses
+20r+35=+(+20r+180)-7
Remove unnecessary parentheses
+20r+35=+20r+180-7
We move all terms containing r to the left and all other terms to the right.
+20r-20r=+180-7-35
We simplify left and right side of the equation.
r=+138
0=138
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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