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-12r-4(-3r-1)=4(r+3)
We simplify the equation to the form, which is simple to understand
-12r-4(-3r-1)=4(r+3)
Reorder the terms in parentheses
-12r+(+12r+4)=4*(r+3)
Remove unnecessary parentheses
-12r+12r+4=+4+*(+r+3+)
Reorder the terms in parentheses
-12r+12r+4=+(+4r+12)
Remove unnecessary parentheses
-12r+12r+4=+4r+12
We move all terms containing r to the left and all other terms to the right.
-12r+12r-4r=+12-4
We simplify left and right side of the equation.
-4r=+8
We divide both sides of the equation by -4 to get r.
r=-2
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