-(ab)^2
    -(an)^2
    4X + 28 = 5 X -4
    1000-X=0.00003*X
    （x-14068.12）*0.03=136
    √((1-(1/2)x)^2+(2x-4)^2)=√((-(3/2)x+3)^2)
    x+10-x/1.13*0.13=84
    a²+4a－40=0
    a²+4a－40=0
    a∧2+4a－40=0
    a∧2+4a－40=0
    1/x-1/x∧x
    1/x-1/x∧x
    1/x-1/x∧2
    18x-21x=0.05*18*21
    21x-18x=0.05*18*21
    21x-18x=0.05x18x21
    18x-21x=0.05x18x21
    10x=15x-22.5
    x^2+(5/13x)^2=1

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