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1/3x(x-20)+40(x-10)=360
We move all terms to the left:
1/3x(x-20)+40(x-10)-(360)=0
Domain of the equation: 3x(x-20)!=0We multiply parentheses
x∈R
1/3x(x-20)+40x-400-360=0
We multiply all the terms by the denominator
40x*3x(x-20)-400*3x(x-20)-360*3x(x-20)+1=0
Wy multiply elements
120x^2(x-1200x(x-1080x(x+1=0
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