(x减5分之2)乘4分之3=12怎么算 7分之5（x减5分之3）=9分之8又怎么算

题目

(x减5分之2)乘4分之3=12怎么算 7分之5（x减5分之3）=9分之8又怎么算

答案

(x-2/5)*3/4 = 12
x-2/5 = 12*4/3 = 16
x = 16+2/5 = 82/5
5/7 (x-3/5) = 8/9
x-3/5 = 8/9*7/5 = 56/45
x = 56/45+3/5 = 83/45