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a in (-oo:+oo)
6*a-10 = 26-6*a // - 26-6*a
6*a-(-6*a)-26-10 = 0
6*a+6*a-26-10 = 0
12*a-36 = 0 // + 36
12*a = 36 // : 12
a = 36/12
a = 3
a = 3
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