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105=-7(5b+5)
We move all terms to the left:
105-(-7(5b+5))=0
We calculate terms in parentheses: -(-7(5b+5)), so:We get rid of parentheses
-7(5b+5)
We multiply parentheses
-35b-35
Back to the equation:
-(-35b-35)
35b+35+105=0
We add all the numbers together, and all the variables
35b+140=0
We move all terms containing b to the left, all other terms to the right
35b=-140
b=-140/35
b=-4
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