Question

Cine le rezolva le dau coroana!!
5x + 4 = 25 - 2x
2z - 4 = 8 - z
6.5y - 15 = 4y + 3.4
3x - 35 = 7x - 28

Answer 1

5x + 4 = 25 - 2x
5x+2x=25-4
7x=21
x=21:7
x=3


2z - 4 = 8 - z
2z+z=8+4
3z=12
z=12:3
z=4

6.5y - 15 = 4y + 3.4
6.5y-4y=3.4+15
2,5y=18,4
y=18,4:2,5
y=7,36


3x - 35 = 7x - 28
3x-7x=35-28
-4x=7
x=-7/4

Answer 2

5x+4=25-2x => 5x+2x=25-4 => 7x=21 => x=21/7 => x=3

2z-4=8-z => 2z+z=8+4 => 3z=12 => z=12/3 => z=4

6,5y-15=4y+3,4 => 6,5y-4y=3,4+15 => 2,5y=18,4 => y=18,4/2,5

3x-35=7x-28 => 3x-7x=-28+35 => -4x=7|•(-1) => 4x=-7 => x=-7/4