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-20=-9+7 (b+5)
We simplify the equation to the form, which is simple to understand
-20=-9+7(b+5)
Reorder the terms in parentheses
-20=-9+(+7b+35)
Remove unnecessary parentheses
-20=-9+7b+35
We move all terms containing b to the left and all other terms to the right.
-7b=-9+35+20
We simplify left and right side of the equation.
-7b=+46
We divide both sides of the equation by -07 to get b.
b=-6.5714285714286
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