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a=8+(2-1)(-3)
We move all terms to the left:
a-(8+(2-1)(-3))=0
We add all the numbers together, and all the variables
a-(8+1(-3))=0
We add all the numbers together, and all the variables
a-5=0
We move all terms containing a to the left, all other terms to the right
a=5
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