2+x
    2×x
    1.5%=x+x×2.4%
    40x-5x²＝20
    40x-5x*2＝20
    3.9%=x+2.4%+x×2.4%
    x+x
    3.9=x+2.4+x×2.4
    (ex)-1
    sinx=0.36x
    400000=100000*1.06^(a-1)+6000a
    x-1/x
    3.5x-0.8x=11.34
    2.8+x+3.6=20
    2.8+x+3.6=20
    9x-14*5.5=58
    5.5x+6.7=7.8
    6.2x-x=41.6
    46x+44x=2070
    6.7x+2.3x=10.8

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