how do i solve this problem 2(2.5B-9)=-7 and 0.7w+16+4w=27.28
Multiply out the parenthese, and combine similar terms (constants and terms that are multiples of the unknown) on separate sides of the equation. For example
2(2.5B-9) = -7
5B -18 = 7
5B = 25
The last step should be obvious.