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3b-(5-b)=15
We simplify the equation to the form, which is simple to understand
3b-(5-b)=15
Remove unnecessary parentheses
3b-5+1b=15
We move all terms containing b to the left and all other terms to the right.
+3b+1b=+15+5
We simplify left and right side of the equation.
+4b=+20
We divide both sides of the equation by 4 to get b.
b=5
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