x-(3/10x+20)=260

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x-(3/10x+20)=260x-(3/10x+20)=260x-(3/10x+20)=260x-3/10x-20=2607/10x=260+20x=280/[7/10]X=400

x-(3/10x+20)=260
x-(3/10x+20)=260

x-(3/10x+20)=260
x-3/10x-20=260
7/10x=260+20
x=280/[7/10]
X=400