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1200=-4a-300
We move all terms to the left:
1200-(-4a-300)=0
We get rid of parentheses
4a+300+1200=0
We add all the numbers together, and all the variables
4a+1500=0
We move all terms containing a to the left, all other terms to the right
4a=-1500
a=-1500/4
a=-375
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