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a in (-oo:+oo)
(5/4)*a-((2/3)*a) = 7/2 // - 7/2
(5/4)*a-((2/3)*a)-(7/2) = 0
(5/4)*a+(-2/3)*a-7/2 = 0
7/12*a-7/2 = 0 // + 7/2
7/12*a = 7/2 // : 7/12
a = 7/2/7/12
a = 6
a = 6
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