1145141919810x = 1919810114514x
    1145141919810x = 1919810114514
    abs(114514 - x) = 0
    abs(x - 1) = 0
    abs(x - 1919810) + abs(114514 - x) = 0
    abs(x - 1919810) + abs(114514 - 2x) = 0
    2t - 4 + 14 - 4t = -2
    (2t - 4 + 14 - 4t) / 2 = -1
    x²+10=8X-1
    -263.2/8.314/300=0.5142+0.0262*300/2+ -1.3712e-05*300^2/3+2.6330e-09*300^3/4+5.0650e-15*300^4/4+x/300
    (42-x)+(40-x)=68
    -263.2/8.314/300=0.5142+0.0262*300/2+x/300
    x∧2/(0.05-x)=1×10∧-14÷1.8÷10∧-5
    x∧3+5x∧2+8x+3=0
    2x=1
    xxxx-10xx+4=0
    x4-10x2+4=0
    arctan(0.1x)+arctanx=90
    arctan(0.1x)+arctan(x)=30
    500/x=[(60-x)*5+500]/60+x

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