5*x*x+12*x+3=0
    0.09*x=90*0.91
    346-346/1.09*0.05-（346/1.09*0.09-X/1.09*0.09）-346*0.03=X
    x²-6x-18=0
    ¾sinx
    2*x+2*(2.76+x)=3*(2.76-x)
    1*2X-1*1.5X=15
    X+X*0.15=8300
    25+x＝32.2+147.9055-x
    30x－0.5x×x＝10
    -3x²+48=210
    -3x²+48x=180
    -3x²+46x=180
    x（-3x+46）=180
    2（x+1）²=2.88
    3/x+2/(x-1)-1/(10-x)=0
    x*x+11.6x=2320
    x=x+10
    x^3+3x^2+5x+4=0
    x3+3x²+5x+4=0

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