Question

2y+20%(2y-1)=7.then y=?

Answer 1

$20\%=\frac{20}{100}=0.2\\\\2y+0.2(2y-1)=7\\2y+0.4y-0.2=7\\2.4y-0.2=7\\2.4y=7+0.2\\2.4y=7.2\ \ \ \ \ | divide\ both\ sides\ by\ 2.4\\\\ y=\frac{7.2}{2.4}\\\\y=\frac{72}{24}\\\\\fbox{y=3}$

Answer 2

2y + 1/5(2y-1)=7
2y+2y/5-1/5 =7
(12y-1)/5=7
12y-1=35
12y=36
y=3