x-0.8x=4.2

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x-0.8x=4.2x-0.8x=4.2x-0.8x=4.20.2X=4.2X=21(1-0.8)x=4.2,0.2x=4.2,x=21

x-0.8x=4.2
x-0.8x=4.2

x-0.8x=4.2
0.2X=4.2
X=21

(1-0.8)x=4.2,0.2x=4.2,x=21