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8(-5b+4)+8b=-128
We move all terms to the left:
8(-5b+4)+8b-(-128)=0
We add all the numbers together, and all the variables
8b+8(-5b+4)+128=0
We multiply parentheses
8b-40b+32+128=0
We add all the numbers together, and all the variables
-32b+160=0
We move all terms containing b to the left, all other terms to the right
-32b=-160
b=-160/-32
b=+5
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