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90=1/2x+39
We move all terms to the left:
90-(1/2x+39)=0
Domain of the equation: 2x+39)!=0We get rid of parentheses
x∈R
-1/2x-39+90=0
We multiply all the terms by the denominator
-39*2x+90*2x-1=0
Wy multiply elements
-78x+180x-1=0
We add all the numbers together, and all the variables
102x-1=0
We move all terms containing x to the left, all other terms to the right
102x=1
x=1/102
x=1/102
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