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a in (-oo:+oo)
-(7*a)-2 = (3/5)*a-(88/25) // - (3/5)*a-(88/25)
88/25-(7*a)-((3/5)*a)-2 = 0
(-3/5)*a-7*a+88/25-2 = 0
38/25-38/5*a = 0 // - 38/25
-38/5*a = -38/25 // : -38/5
a = -38/25/(-38/5)
a = 1/5
a = 1/5
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