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2a+3=126+4a
We move all terms to the left:
2a+3-(126+4a)=0
We add all the numbers together, and all the variables
2a-(4a+126)+3=0
We get rid of parentheses
2a-4a-126+3=0
We add all the numbers together, and all the variables
-2a-123=0
We move all terms containing a to the left, all other terms to the right
-2a=123
a=123/-2
a=-61+1/2
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