2x+[0.8×(24-x)]=30

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2x+[0.8×(24-x)]=302x+[0.8×(24-x)]=302x+[0.8×(24-x)]=302x+[0.8×(24-x)]=302x+19.2-0.8x=302x-0.8x=30-19

2x+[0.8×(24-x)]=30
2x+[0.8×(24-x)]=30

2x+[0.8×(24-x)]=30
2x+[0.8×(24-x)]=30
2x+19.2-0.8x=30
2x-0.8x=30-19.2
1.2x=10.8
x=10.8÷1.2
x=9

2x+[0.8×(24-x)]=30
2x+19.2-0.8x=30
1.2x=10.8
x=9

2x+[0.8×(24-x)]=30
2x+19.2-0.8x=30
1.2x=10.8
x=9