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a in (-oo:+oo)
(2/7)*a-(2/3) = -6/7 // + -6/7
(2/7)*a-(2/3)-(-6/7) = 0
(2/7)*a-2/3+6/7 = 0
2/7*a+4/21 = 0 // - 4/21
2/7*a = -4/21 // : 2/7
a = -4/21/2/7
a = -2/3
a = -2/3
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