2.8x = 19.32-6.4x solve the equation, written in the book,

2.8x = 19.32-6.4x solve the equation, written in the book,

2.8x+6.4x=19.32
9.2x=19.32
x=2.1

Solving the equation x ^ 2 + 4x + 8 = 4x + 11 x (2X-4) = 5-8x by collocation method

x^2+4x+8=4x+11
x^2=3
x=±√3
x（2x-4）=5-8x
2x^2-4x=5-8x
2x^2+4x=5
x^2+2x+1=7/2
(x+1)^2=7/2
x+1=±1/2√14
x=-1±1/2√14

Solve the equation 4x = (X-2) and calculate (2x-8x + 8) / (X-2)

4x2 = (X-2) 2 = x2-4x + 4 is reduced to (3x-2) * (x + 2) = 0, so x = - 2 or x = 2 / 3
（2x2-8x+8）／（x-2）=2（x-2）2∕（x-2）=2（x-2）
Then x = - 2 and x = 2 ／ 3 are substituted into the solution of X respectively