0.3*7+4x=12.5
    12x+2.4=24
    x/6=3.5
    x+1.8=3.6
    5.8x-3.3x=20
    2.8x-14.4=x+14.4
    57*(x+10)+63x=1350
    3x-1.5x=1.2
    (16-2x)/3=0.4
    (1.7+4x)/1.5=6.6
    42x-x=382-13
    7.2-3x=2.46
    4.5*8+x=91
    0.3x+4.5x=31.2
    (x-23)/2+(x-19)/4+(x-15)/6+(x-11)/8+(x-7)/10=10
    2.34*3x=4.914
    2(x-0.5)=12.8
    x+（3x-20）=300
    x+（3x-20）=300
    50x^15+50x^14+50x^13+50x^12+50x^11 =459.674

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