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7-7(-13b-19)=-7(-16b+4)
We simplify the equation to the form, which is simple to understand
7-7(-13b-19)=-7(-16b+4)
Reorder the terms in parentheses
7+(+91b+133)=-7*(-16b+4)
Remove unnecessary parentheses
+7+91b+133=-7+*(-16b+4+)
Reorder the terms in parentheses
7+91b+133=+(+112b-28)
Remove unnecessary parentheses
+7+91b+133=+112b-28
We move all terms containing b to the left and all other terms to the right.
+91b-112b=-28-7-133
We simplify left and right side of the equation.
-21b=-168
We divide both sides of the equation by -21 to get b.
b=8
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