s^2+7s+3=0
    -2x+3=4x-9
    4x-3=7-x
    200x^3+45x^2+8x=0
    200x^3+42x+15=0
    x＾3=8
    x+568=66
    200x^3+42x-5=0
    X+50/100*X=75
    X+50/100*X=750
    x+50%X=750
    81/4t^4-56t^3+71t^2+1/2t^2=0
    81/4 t^4-56t^3+71t^2+1/2t^2=0
    2*x^2 + 3*x - 324 = 0
    x²-140x=4000
    lnx÷x
    4x^3+15x^2+16x+6=0
    x=arctanx+π/4
    2(1-x)=x-3
    tanx=x+π/4

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