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q in (-oo:+oo)
420*(e-(0.1*q)-(5/6)+1) = 0
420*(e-0.1*q-5/6+1) = 0
420*(e-0.1*q+1/6) = 0
e-0.1*q+1/6 = 0 // - e+1/6
-0.1*q = -(e+1/6) // : -0.1
q = (-(e+1/6))/(-0.1)
q = 10*(e+1/6)
q = 10*(e+1/6)
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