x+13%-28%=3.4===

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x+13%-28%=3.4===
x+13%-28%=3.4
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x+13%-28%=3.4===
x+13%-28%=3.4
x-0.15=3.4
x=0.15+3.4
= 3.55

x-15%=3.4
x-0.15=3.4
x=3.55

X+13%=3.4+28%
x=3.55

X+13%-28%=3.4 两边同乘以100得 100X+13-28=340 100X=340+28-13 X=3.55