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a in (-oo:+oo)
5*a-((3/4)*a)-1 = -55/4 // + -55/4
5*a-((3/4)*a)-(-55/4)-1 = 0
5*a+(-3/4)*a+55/4-1 = 0
17/4*a+51/4 = 0 // - 51/4
17/4*a = -51/4 // : 17/4
a = -51/4/17/4
a = -3
a = -3
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