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a in (-oo:+oo)
a/4-((2*a)/4) = 0.25 // - 0.25
a/4-((2*a)/4)-0.25 = 0
a/4+(-1/2)*a-0.25 = 0
-1/4*a-0.25 = 0 // + 0.25
-1/4*a = 0.25 // : -1/4
a = 0.25/(-1/4)
a = -1
a = -1
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