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a in (-oo:+oo)
(6/7)*a-a-10 = -65/7 // + -65/7
(6/7)*a-a-(-65/7)-10 = 0
(6/7)*a-a+65/7-10 = 0
-1/7*a-5/7 = 0 // + 5/7
-1/7*a = 5/7 // : -1/7
a = 5/7/(-1/7)
a = -5
a = -5
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