(0.6x+420)/(x+20)=3

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(0.6x+420)/(x+20)=3(0.6x+420)/(x+20)=3(0.6x+420)/(x+20)=3(0.6x+420)/(x+20)=30.6x+420=3x+603x-0.6x=42

(0.6x+420)/(x+20)=3
(0.6x+420)/(x+20)=3

(0.6x+420)/(x+20)=3
(0.6x+420)/(x+20)=3
0.6x+420=3x+60
3x-0.6x=420-60
2.4x=360
x=150

X=150

0.6x+420=3x+60
2.4x=360
x=150

3(X+20)=0.6X+420
3X+60=0.6X+420
2.4X=360
X=150