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a in (-oo:+oo)
10-(3*a)-(6*a) = -26 // + 26
10-(3*a)-(6*a)+26 = 0
10-3*a-6*a+26 = 0
36-9*a = 0 // - 36
-9*a = -36 // : -9
a = -36/(-9)
a = 4
a = 4
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