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5a-2a=-12+2
We move all terms to the left:
5a-2a-(-12+2)=0
We add all the numbers together, and all the variables
5a-2a-(-10)=0
We add all the numbers together, and all the variables
3a+10=0
We move all terms containing a to the left, all other terms to the right
3a=-10
a=-10/3
a=-3+1/3
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