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x=1/4(90-x)
We move all terms to the left:
x-(1/4(90-x))=0
Domain of the equation: 4(90-x))!=0We add all the numbers together, and all the variables
x∈R
x-(1/4(-1x+90))=0
We multiply all the terms by the denominator
x*4(-1x+90))-(1=0
Wy multiply elements
4x^2(-=0
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