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2a -6 = a+3

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2a-6=a+3 solve:  add 6 to both sides of the equation to get "a" on a side by itself, 2a-6+6=a+3+6  this gives you 2a=a+9,  then, subtract "a" from both sides 2a-a=a-a+9, this gives you the answer, a=9