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-r/4+3=-10.5
We move all terms to the left:
-r/4+3-(-10.5)=0
We add all the numbers together, and all the variables
-r/4+13.5=0
We multiply all the terms by the denominator
-r+(13.5)*4=0
We add all the numbers together, and all the variables
-1r+54=0
We move all terms containing r to the left, all other terms to the right
-r=-54
r=-54/-1
r=+54
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