( 32 - 3x )( 20 - 2x )=240
    24x-x²=80
    x（1.5+0.1x）=25
    x（1.5-0.1x）25
    x（2-0.1x+0.5）=25
    (absx-1)^2
    （e^x+x）^（1÷x）
    （10+x）（600-10x）=10000
    x^2-70x+825 = 0
    2×x^2-33x+135 = 0
    x（44-2x）=224
    a^5+a^4+a^3+a^2+a+1=0
    622.301592*√（584.76-x∧²）＝683888.5152-2×x∧²
    cosx ＋3
    154386x-4718x-453.91x-4125.98 = 36272
    5*x^20-x^40=4
    154388x-4718x-453.91x-4125.98=3627202
    x^4
    2=x/46125
    x＝tanx

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