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x+3/4(2x-20)=80
We move all terms to the left:
x+3/4(2x-20)-(80)=0
Domain of the equation: 4(2x-20)!=0We multiply all the terms by the denominator
x∈R
x*4(2x-20)-80*4(2x-20)+3=0
Wy multiply elements
4x^2(2-320x(2+3=0
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