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-10b+19=-5b+4
We move all terms to the left:
-10b+19-(-5b+4)=0
We get rid of parentheses
-10b+5b-4+19=0
We add all the numbers together, and all the variables
-5b+15=0
We move all terms containing b to the left, all other terms to the right
-5b=-15
b=-15/-5
b=+3
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