1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*0.6854)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*0.628658)
    2=1/2x
    0.75=0.5+(x-35)*0.05-(15+0)*0.05
    0.75=0.5+(x-33)*0.05-(15+10)*0.05
    0.7784x-0.08915sin(2πx)-0.091=0.2122(sin(πx))^3+0.0362sin(πx)+0.0362sin(1.25π-2πx)
    -x-5=x^2-4x-5
    x^2+x-6=0
    （e＾x）／x-lnx
    x²-14x+32=0
    4600/x=2.45
    1.7=-0.1x^2+0.6x+0.9
    x^2-19x+64
    1.2×(1-x）∧＝1.452
    1x（1+4%）÷10+4%
    10000*p*25%= 10000*p-10000*p*5%-（200*10000+850000 )
    (X+1)(X+2)(X+3)(X+4)=8
    4*x*x-16*√7*x=(x*x-4*√7*x+28)*(2+√(4-x)*x)
    4*x*x-16*√7*x=(x*x-4*√7*x+28)*(2+√(4-x)*x)
    4*x*x-16*√7*x=(x*x-4*√7*x+28)*(2+√(4-x)*x)

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