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-13b+200=-9b+140
We move all terms to the left:
-13b+200-(-9b+140)=0
We get rid of parentheses
-13b+9b-140+200=0
We add all the numbers together, and all the variables
-4b+60=0
We move all terms containing b to the left, all other terms to the right
-4b=-60
b=-60/-4
b=+15
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