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a in (-oo:+oo)
(2/3)*a-((1/3)*a)+1/7 = -41/252 // + -41/252
(2/3)*a-((1/3)*a)+1/7-(-41/252) = 0
(2/3)*a+(-1/3)*a+1/7+41/252 = 0
1/3*a+11/36 = 0 // - 11/36
1/3*a = -11/36 // : 1/3
a = -11/36/1/3
a = -11/12
a = -11/12
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