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-12r+9(6+4r)=12+3(7+8r)
We simplify the equation to the form, which is simple to understand
-12r+9(6+4r)=12+3(7+8r)
Reorder the terms in parentheses
-12r+(+54+36r)=12+3*(7+8r)
Remove unnecessary parentheses
-12r+54+36r=+12+3+*(+7+8r+)
Reorder the terms in parentheses
-12r+54+36r=12+(+21+24r)
Remove unnecessary parentheses
-12r+54+36r=+12+21+24r
We move all terms containing r to the left and all other terms to the right.
-12r+36r-24r=+12+21-54
We simplify left and right side of the equation.
r=-21
0=-21
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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