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x in (-oo:+oo)
0.03*((4*x)/7)*x = 79.69 // - 79.69
0.03*((4*x)/7)*x-79.69 = 0
0.0171428571*x^2 = 79.69 // : 0.0171428571
x^2 = 4648.58334495
x^2 = 4648.58334495 // ^ 1/2
abs(x) = 4648.58334495^(1/2)
x = 4648.58334495^(1/2) or x = -4648.58334495^(1/2)
x in { 4648.58334495^(1/2), -4648.58334495^(1/2) }
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