(0.4+0.9)/0.5-(0.03+0.02x)/0.03=(x-5)/2

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(0.4+0.9)/0.5-(0.03+0.02x)/0.03=(x-5)/2(0.4+0.9)/0.5-(0.03+0.02x)/0.03=(x-5)/2(0.4+0.9)/0.5-(0.03+0.

(0.4+0.9)/0.5-(0.03+0.02x)/0.03=(x-5)/2
(0.4+0.9)/0.5-(0.03+0.02x)/0.03=(x-5)/2

(0.4+0.9)/0.5-(0.03+0.02x)/0.03=(x-5)/2
(0.4x+0.9)/0.5-(0.03+0.02x)/0.03=(x-5)/2
左右两边同×30得：60（0.4x+0.9）-1000(0.03+0.02x)=15(x-5)
24x+54-30-20x-15x+75=0
-11x+99=0
x=9