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4a+3-a=-72+a
We move all terms to the left:
4a+3-a-(-72+a)=0
We add all the numbers together, and all the variables
4a-a-(a-72)+3=0
We add all the numbers together, and all the variables
3a-(a-72)+3=0
We get rid of parentheses
3a-a+72+3=0
We add all the numbers together, and all the variables
2a+75=0
We move all terms containing a to the left, all other terms to the right
2a=-75
a=-75/2
a=-37+1/2
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