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i/0.5=-15
We move all terms to the left:
i/0.5-(-15)=0
We add all the numbers together, and all the variables
i/0.5+15=0
We multiply all the terms by the denominator
i+15*0.5=0
We add all the numbers together, and all the variables
i+7.5=0
We move all terms containing i to the left, all other terms to the right
i=-7.5
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