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    5s+5=s
    x²+5x+6=0
    (2-x)(x-4)=0
    X/135+100/141-.1=0.00522(200+X)
    X/135+100/141-.1=0.00537(200+X)
    X/135+42/141-.1=0.00537(142+X)
    2x^3-5x^2-x+30
    3x²-10x+7=0
    7(X-2)=9.8
    arctan0.12x+arctan0.02x=90
    -12*x^3+17*x^2-2x-3=0
    x- x*0.5%= 1768.92918761
    (x+3)²+(x+5)²=(2x)²
    x - x *0.5/100 =1768.92918761
    x^2-18.6789*x=464.75
    2+7x=670
    ((1/4)^x+3*(1/2)^x+2)^(1/2)
    4x+2×12=52
    [(1/4)^x+3(1/2)x+2]^1/2
    [(1/4)^x+3(1/2)x+2]^1/2

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