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b+3/2b+(b+45)+90+(2b-90)=180
We simplify the equation to the form, which is simple to understand
b+3/2b+(b+45)+90+(2b-90)=180
Remove unnecessary parentheses
+b+/2b+b+45+90+(+2b-90+)=+180
Remove unnecessary parentheses
+b+/2b+b+45+90+2b-90=+180
We move all terms containing b to the left and all other terms to the right.
+1b+2b+1b+2b=+180-45-90+90
We simplify left and right side of the equation.
+6b=+135
We divide both sides of the equation by 6 to get b.
b=22.5
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