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Answer 1 · 2018-01-24T17:58:08

Three more than twice a number #b# is equal to 24.

#2xxb+3=24#

Now, whatever we do to one side, we do to the other.

Say we subtract 3 from both sides.

#2xxb+3color(red)(-3)=24color(red)(-3)#

#2b=21#

Now, divide both sides by 2.

#(2b)/color(blue)(2)=21/color(blue)2#

#b=21/2#