40x+60(8-x)=420 (细节要写清楚)

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40x+60(8-x)=420(细节要写清楚)40x+60(8-x)=420(细节要写清楚)40x+60(8-x)=420(细节要写清楚)40x+60(8-x)=420;40x+480-60x=420

40x+60(8-x)=420 (细节要写清楚)
40x+60(8-x)=420 (细节要写清楚)

40x+60(8-x)=420 (细节要写清楚)
40x+60(8-x)=420;
40x+480-60x=420;
-20x=-60;
x=3;
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40x+60(8-x)=420
40x+480-60x=420
40x-60x=420-480
-20x=-60
x=-60÷(-20)
x=3

40x+480-60x=420
(40-60)x=420-480
-20x=-60
x=3

40x+60(8-x)=420
40X+480-60X=420
-20X+480=420
-20X=420-480
-20X=-60
X=3

40x+480-60x=420
40x-60x=420-480
-20x=-60
20x=60
x=3

40x+480-60x=420
20x=60
x=3