1 / 20x-51 / 4 = 3 / 4 / table is fast division solve equations

1 / 20x-51 / 4 = 3 / 4 / table is fast division solve equations

X=(3/4+51/4)x20=270

First, judge the proportion of X and y, and fill in the table x6.4 12.8 19.2 51.2 y13,5 15 x 20 15 10 40.5 y6 12 48
There's a space behind 48

First judge the proportion of X and Y in filling out the form
The first positive proportion
X 6.4 12.8 19.2 32 51.2 96
Y 1 2 3 5 8 15
Positive proportion
The second inverse proportion
X 20 15 10 4 ?0.5
Y 6 4.5 12 48

How to solve 1.5x-20 = x 20

1.5X-20=X+ 20
1.5X-X=20+20
0.5X=40
X=80

How to solve (x-4) 2 = 5x + 20
I don't know how to factorize,

2x-8=5x+20
-8-20=5x-2x
3x=-28
x=-28/3