(0.4x-2.1)/0.5=(0.1+0.2x)/0.03-0.6

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(0.4x-2.1)/0.5=(0.1+0.2x)/0.03-0.6(0.4x-2.1)/0.5=(0.1+0.2x)/0.03-0.6(0.4x-2.1)/0.5=(0.1+0.2x)/0.03-0

(0.4x-2.1)/0.5=(0.1+0.2x)/0.03-0.6
(0.4x-2.1)/0.5=(0.1+0.2x)/0.03-0.6

(0.4x-2.1)/0.5=(0.1+0.2x)/0.03-0.6
(0.4x-2.1)/0.5=(0.1+0.2x)/0.03-0.6
两边乘1.5
3(0.4x-2.1)=50(0.1+0.2x)-0.9
3*0.4x-3*2.1=50*0.1+50*0.2x-0.9
1.2x-6.3=5+x-0.9
1.2x-x=5-0.9+6.3
0.2x=10.4
x=10.4÷0.2
x=52