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x in (-oo:+oo)
((2-4*x)^2)/5 = ((-(3*x)-7)^2)/5 // - ((-(3*x)-7)^2)/5
((2-4*x)^2)/5-(((-(3*x)-7)^2)/5) = 0
((2-4*x)^2)/5-(((-3*x-7)^2)/5) = 0
((2-4*x)^2)/5+(-1*(-3*x-7)^2)/5 = 0
(2-4*x)^2-1*(-3*x-7)^2 = 0
7*x^2-58*x-45 = 0
7*x^2-58*x-45 = 0
7*x^2-58*x-45 = 0
DELTA = (-58)^2-(-45*4*7)
DELTA = 4624
DELTA > 0
x = (4624^(1/2)+58)/(2*7) or x = (58-4624^(1/2))/(2*7)
x = 9 or x = -5/7
(x+5/7)*(x-9) = 0
((x+5/7)*(x-9))/5 = 0
((x+5/7)*(x-9))/5 = 0 // * 5
(x+5/7)*(x-9) = 0
( x+5/7 )
x+5/7 = 0 // - 5/7
x = -5/7
( x-9 )
x-9 = 0 // + 9
x = 9
x in { -5/7, 9 }
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