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6a-4-6=9a-4,5+0,5=6a-9a=-4-6-4,5+0,5=-4-6-5+-4-1=-3
6a-4-6=9a-4.5+0.5
6a-10=9a-4 / +10
6a=9a+6 / - 9a
-3a=6 /: -3
a = 2