两边乘以20
5(4X+20)-4(6X-20)=40
20X+100-24X+80=40
24X-20X=100+80-40
4X=140
X=140÷4
X=35
(4X+20)/4-(6X-20)/5 =2
5×(4X+20)-4×(6X-20) =2×20
20X+100-24X+80 =40
4X=100+80-40
4X =140
X=35
(4X+20)/4-(6X-20)/5=2
等式两边同时乘以20 5*(4X+20)-4*(6X-20)=40
20X+100-24X+80=40
24X-20X=100+80-40
4X=140
X=35