5/4（x+21)=4/6-1/2(x-9)答案是多少?一元一次方程求解开!

Question

5/4（x+21)=4/6-1/2(x-9) 答案是多少?一元一次方程求解开!

Answer 1

5/4（x+21)=4/6-1/2(x-9)
15（x+21)=2*4-6(x-9)
15x+315=8-6x+54
15x+6x=8+54-315
21x=-253
x=-12又1/21