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a in (-oo:+oo)
-((2/7)*a)-6 = -374/63 // + -374/63
-((2/7)*a)-(-374/63)-6 = 0
(-2/7)*a+374/63-6 = 0
-2/7*a-4/63 = 0 // + 4/63
-2/7*a = 4/63 // : -2/7
a = 4/63/(-2/7)
a = -2/9
a = -2/9
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