(x+1.4)*0.4=2.4
    5x+4*1.5=13.5
    6.9x-2.6x=10.32
    6.9x-2.6=10.32
    24(A+14.2)=95A
    24(A+14.2)=94A
    56(A+14.2)=127A
    65(A+14.2)=136A
    23(A+14.2)=94A
    1.12X＝1.77
    x-ln（x+1）-1＝0
    x-ln（x+1）-1＝0
    x-ln（x+1）-1＝0
    x-ln（x+1）-1＝0
    sinpi=0
    11x-10=500
    150*0.6+（x-150）0.65+0.9（x-300）=277.5
    ln（x+1）=x*sinx
    150*0.6+0.65x=277.5
    90+0.65x-97=277.5

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