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4a+8=2-12
We move all terms to the left:
4a+8-(2-12)=0
We add all the numbers together, and all the variables
4a+8-(-10)=0
We add all the numbers together, and all the variables
4a+18=0
We move all terms containing a to the left, all other terms to the right
4a=-18
a=-18/4
a=-4+1/2
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