4x+0.5x-4.5×0.8=0

4x+0.5x-4.5×0.8=0

4x＋0.5x－4.5×0.8＝0
4.5x－3.6＝0
4.5x＝3.6
x＝3.6÷4.5
x＝0.8
Don't understand can ask!

What is the solution of 5x + 4 = 4x-8

5x+4=4x-8
5x-4x=-8-4
x=-12

{4x + 7 (y + 10 / 11) = 1 {5x - (y + 10 / 11) = 11} solving binary linear equations (need process) urgent!

Let y + 10 / 11 = M
{4x+7m=1 ①
{5x-m=11 ②
②*7+① 39x=78
The solution is x = 2
Substituting into 2, M = - 1
That is y + 10 / 11 = - 1
∴y=-21/11
The solution of the original equations is
x=2,
y=-21/11

Solving equations 4x + 7 (y + 10 / 11) = 1 5x - (y + 10 / 11) = 11
There is also a 4 (x-0.123) + 7 (y + 3.45) = 1
5（x-0.123)-（y+3.45)=11
They all use the substitution method

4X + 7 (y + 10 / 11) = 1 (1) (I didn't give you the specific calculation, I feel how this data is given so.) 5x - (y + 10 / 11) = 11 (2) and (2) know that y + 10 / 11 = 11-5x substitute (1) 4x + 7 (11-5x) = 1x = 76 / 31Y = 11-5 * 76 / 314 (x-0.123) + 7 (y + 3.45) = 1 (1) 5 (x-0.123) - (y + 3.45) = 1