81-x=72-x
    (x-1)÷7=(x-3)÷5
    2x+52+10=(2x+2×10)×2
    5x-8=(x-8)×13
    x+1/（1-x）+（x-1）/x=19/6
    9%÷x=1.8
    9%÷X=1.8
    （40÷X+8.5）÷（50÷X+6.8）=0.507÷0.493
    5（x^2）+36x-14=0
    x＾3-2x∧2-144 = 0
    x＾3-2x∧2-144 = 0
    x＾3-2x∧2-144 = 0
    x＾3-2x∧2-144 = 0
    x＾3-2x∧2-144 = 0
    x＾3-2x∧2-144 = 0
    x＾3-2x∧2-144 = 0
    x3-2x2-144=0
    x3-2x2-144=0
    x3-2x2-144=0
    x^2-(1/7)x-3=0

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