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8.3+x/5=-4.2
We move all terms to the left:
8.3+x/5-(-4.2)=0
We add all the numbers together, and all the variables
x/5+12.5=0
We multiply all the terms by the denominator
x+(12.5)*5=0
We add all the numbers together, and all the variables
x+62.5=0
We move all terms containing x to the left, all other terms to the right
x=-62.5
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