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a in (-oo:+oo)
1-6*a = 6*a-35 // - 6*a-35
1-6*a-(6*a)+35 = 0
1-6*a-6*a+35 = 0
36-12*a = 0 // - 36
-12*a = -36 // : -12
a = -36/(-12)
a = 3
a = 3
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