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a in (-oo:+oo)
(3*a)/8-(9/12)+7/2 = 7 // - 7
(3*a)/8-(9/12)+7/2-7 = 0
(3*a)/8-3/4+7/2-7 = 0
3/8*a-17/4 = 0 // + 17/4
3/8*a = 17/4 // : 3/8
a = 17/4/3/8
a = 34/3
a = 34/3
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