How to calculate x-20 = 6 / 7x-5 / 6 And talk about how to deal with this kind of problem

How to calculate x-20 = 6 / 7x-5 / 6 And talk about how to deal with this kind of problem

X-20=6/7X-5/6;
x-6x/7=20-5/6;
x/7=115/6;
x=805/6;
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Find X: (7x + 4) ^ 2 - (7X-2) ^ 2 = 180
Using factorization

（7X+4+7X-2）（7X+4-7X+2）＝180
（14X+2）×6＝180
14X=28
X=2

x+40%=140 7x+500%=75 48-20%x=28 75%x=90=150 (x-40)%=0.2 (4.5-50%)x=180

x+40%=140
x=140-40%
x=139.6
7x+500%=75
7x=75-500%
7x=70
x=10
48-20%x=28
20%x=48-28
20%x=20
x=100
75%x=90
x=120
75%x=150
x=200
(x-40)%=0.2
x%-40%=0.2
x%=0.6
x=60
(4.5-50%)x=180
4x=180
x=45