3^x+x=30
    3^x+x=30
    3^x+3=30
    -2x×x＋120x=1750
    -2xXx＋120x=1750
    -2x+x＋120x=1750
    －2x２＋120x=1750
    2x*2-6x-36=0
    x^2+x-6=0
    2x^2-6x-36=0
    2x/2-6x-36=0
    x/2+x-6=0
    2x/2-6x-36=0
    2x/2-6x-36=0
    1.3x+2.9*(22-x)=51
    1.3x+2.9*(22-x)
    2x+4(35-x)=9
    x(10-x)=5/4
    2.4^n = 15
    sqrt(1-a^2)=4*a^3-3*a

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