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x+1/5(180-x)=72
We move all terms to the left:
x+1/5(180-x)-(72)=0
Domain of the equation: 5(180-x)!=0We add all the numbers together, and all the variables
x∈R
x+1/5(-1x+180)-72=0
We multiply all the terms by the denominator
x*5(-1x+180)-72*5(-1x+180)+1=0
Wy multiply elements
5x^2(--360x(-+1=0
We use the square of the difference formula
5x^2(+360x(-1=0
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