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a in (-oo:+oo)
(-4/7)*a-((2/3)*a)+7/9 = 265/441 // - 265/441
(-4/7)*a-((2/3)*a)+7/9-(265/441) = 0
(-4/7)*a+(-2/3)*a+7/9-265/441 = 0
26/147-26/21*a = 0 // - 26/147
-26/21*a = -26/147 // : -26/21
a = -26/147/(-26/21)
a = 1/7
a = 1/7
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