3（x+2.1)/3=10.5/3
    28+6x=88
    8x-15*6=3x-20
    x^3-3x+25/12=0
    5*3-x/2=8
    (8+x)/5=15
    (2x+7)*2=4x+14
    x+2x+8=80
    3x+7=2x+12
    4(5x+6)=144
    (9x-3)*5=390
    5x+x➗5＝52
    -1*x^-2*ln(x)+x^-2=0
    （lnx）^1÷x
    （lnx）^1÷x
    1-e^(-x)
    X^2+7X＝980
    x/510*(20*510)=2
    x/510*(20*510)=2
    20000/x*(20*x)=2

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