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a in (-oo:+oo)
-7/10 = (3*a)/4-(13/20) // - (3*a)/4-(13/20)
13/20-((3*a)/4)-7/10 = 0
(-3/4)*a-7/10+13/20 = 0
-3/4*a-1/20 = 0 // + 1/20
-3/4*a = 1/20 // : -3/4
a = 1/20/(-3/4)
a = -1/15
a = -1/15
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