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1.5(4+r)=-4.5
We move all terms to the left:
1.5(4+r)-(-4.5)=0
We add all the numbers together, and all the variables
1.5(r+4)-(-4.5)=0
We add all the numbers together, and all the variables
1.5(r+4)+4.5=0
We multiply parentheses
1.5r+6+4.5=0
We add all the numbers together, and all the variables
1.5r+10.5=0
We move all terms containing r to the left, all other terms to the right
1.5r=-10.5
r=-10.5/1.5
r=-7
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