7.2r+5.1r=-8.61

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Solution for 7.2r+5.1r=-8.61 equation: 



7.2r+5.1r=-8.61

We move all terms to the left:

7.2r+5.1r-(-8.61)=0

We add all the numbers together, and all the variables

12.3r+8.61=0

We move all terms containing r to the left, all other terms to the right

12.3r=-8.61

r=-8.61/12.3

r=-1.8676789587852/2.6681127982646

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