20000÷x+17600÷(x+30)=10000÷70
    20000÷X+17600÷(X+30)=10000÷70
    20000/X+17600/(X+30)=10000/70
    20000/X+17600/(X+30)=10000/70
    20000/x+17600/(x+30)=10000/70
    17600/(x+30)+20000/x=10000/70
    （17600/(x+30))+20000/x=10000/70
    （17600/(x+30))+20000/x=10000/70
    17600/(x+30)+20000/x=10000/70
    -（2-x)(x+1)^2
    1500÷x-1800÷1.5x=30
    5*(x^2)+4*√15*x+5=0
    1-(1/30)x=(1/50)(x+30)
    1-(1/30)x=(1/50)(x+30)
    (12+x)/(200+x)=0.2
    X^²
    x/578+x/2080=22
    x/578+x/2080=22
    x/578+x/2080=22
    x/578+x/2080=22

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