11169.15=（220*63-x）*0.95+63*8
    （8-2x）^2+（9-2x）^2＝4x^2
    x＋x²＝36
    x∧3＝6×x＋7
    791-x+(480-x)*2/3=1010
    0.42=-2×(x-0.5)²+0.5
    x/1.2+2=x+3/1.25
    x+55=x*6
    x-1.8-5.4=0.4x
    3^x=x^9
    （9/600）x^3-3x^2+150x=0
    x*99.975%-128.123*100.025%=2/10
    x*99.975%-128.123*100.025%=1/10
    1/x +1/（x+1）+1/（x+7）-1/（x+5）=0
    25+x＝32.91+149.929-x
    11169.15=（220*63-x）*0.95
    s^2-6×0.183s+0.183×0.183=0
    8000-640-160-24-（8000x）-3%【3000-8000+640+160+24+（8000x）】=6687.07
    (t^2+4)(-2t)=t^2
    36-（√（10）+x）^2=10-x^2

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