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2(b-3.9)=4(b+1)
We simplify the equation to the form, which is simple to understand
2(b-3.9)=4(b+1)
Reorder the terms in parentheses
+(+2b-7.8)=4*(b+1)
Remove unnecessary parentheses
+2b-7.8=+4+*(+b+1+)
Reorder the terms in parentheses
+2b-7.8=+(+4b+4)
Remove unnecessary parentheses
+2b-7.8=+4b+4
We move all terms containing b to the left and all other terms to the right.
+2b-4b=+4+7.8
We simplify left and right side of the equation.
-2b=+11.8
We divide both sides of the equation by -2 to get b.
b=-5.9
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