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13=6(5-b)+5(b-4)
We simplify the equation to the form, which is simple to understand
13=6(5-b)+5(b-4)
Reorder the terms in parentheses
13=+(+30-6b)+5*(b-4)
Remove unnecessary parentheses
+13=+30-6b+5+*(+b-4+)
Reorder the terms in parentheses
13=+30-6b+(+5b-20)
Remove unnecessary parentheses
+13=+30-6b+5b-20
We move all terms containing b to the left and all other terms to the right.
+6b-5b=+30-20-13
We simplify left and right side of the equation.
+1b=-3
We divide both sides of the equation by 1 to get b.
b=-3
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