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5b+4b-12b+-4b=-10
We move all terms to the left:
5b+4b-12b+-4b-(-10)=0
We add all the numbers together, and all the variables
-7b+10=0
We move all terms containing b to the left, all other terms to the right
-7b=-10
b=-10/-7
b=1+3/7
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