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7+42/x=13
We move all terms to the left:
7+42/x-(13)=0
Domain of the equation: x!=0We add all the numbers together, and all the variables
x∈R
42/x-6=0
We multiply all the terms by the denominator
-6*x+42=0
We add all the numbers together, and all the variables
-6x+42=0
We move all terms containing x to the left, all other terms to the right
-6x=-42
x=-42/-6
x=+7
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