1/4×（x-0.75）=13/16
x-0.75=13/16÷1/4
x-0.75=13/16×4
x-0.75=13/4
x-75/100=13/4
x-25/4=13/4
x=38/4
x=19/2
x=9.5
写的比较详细,有点多,可以缩略一点