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r+4.2/3=-2.5
We move all terms to the left:
r+4.2/3-(-2.5)=0
We add all the numbers together, and all the variables
r+2.5+4.2/3=0
We multiply all the terms by the denominator
r*3+4.2+(2.5)*3=0
We add all the numbers together, and all the variables
r*3+11.7=0
Wy multiply elements
3r+11.7=0
We move all terms containing r to the left, all other terms to the right
3r=-11.7
r=-11.7/3
r=-3+2.7/3
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