Answer:
Explanation:
-1.5(4-R)=12 divide both sides by -1.5
4-R=12/-1.5 calculate
4-R= -8 subtract 4 from both sides
-R=-8-4 calculate
-R=-12 multiply by -1
R=12
just plug in the a b c and d for r and wich ever one makes that equatio equal then it that on
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