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x in (-oo:+oo)
a*(x/2) = 4/a // - 4/a
a*(x/2)-(4/a) = 0
a*(x/2)-4*a^-1 = 0
1/2*a*x-4*a^-1 = 0 // + -4*a^-1
1/2*a*x = -(-4*a^-1) // : 1/2*a
x = (-(-4*a^-1))/(1/2*a)
x = 8*a^-2
x = 8*a^-2
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