Пожалуйста, засчитай как лучший ответ
1) 5x + 4 = x + 12
5x - x = 12 - 4
4x = 8
x = 2
2) 13 - 5y = 8 - 3y
-5y + 3y = 8 - 13
-2y = -5
y = 2.5
3) 6y - 20 = 2( 5y - 10 ) - 14y
6y - 20 = 10y - 20 - 14y
6y - 10y + 14y = 20 - 20
10y = 0
y = 0
4) 4( x + 3.6 ) = 3x - 1.4
4x + 14.4 = 3x - 1.4
4x - 3x = -14.4 - 1.4
x = -15.8
5) ( 7 - 5k ) - ( 8 - 4k ) + (5k + 6 ) = 8
7 - 5k - 8 + 4k + 5k + 6 = 8
-5k + 4k + 5k = 8 - 7 + 8 - 6
4k = 3
k = 3/4