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a in (-oo:+oo)
1-((21*a)/2) = (-3*a)/2-((7*a)/2)+2 // - (-3*a)/2-((7*a)/2)+2
(7*a)/2-((21*a)/2)-((-3*a)/2)-2+1 = 0
(-21/2)*a+(3/2)*a+(7*a)/2-2+1 = 0
-11/2*a-1 = 0 // + 1
-11/2*a = 1 // : -11/2
a = 1/(-11/2)
a = -2/11
a = -2/11
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