Найдите корень уравнения:
а) 2x + 3x + 4 = 14;
б) 7z − z + 5 = 11;
в) 8y − 4y − 12 = −50;
г) −10 + x + x = −26;
д) 10y − 3y − 9 = 40;
е) −y + 8 − 14y = 23.
2x + 3x + 4 = 14
5x = 14 − 4
5x = 10
x = 10 : 2
x = 5
7z − z + 5 = 11
6z = 11 − 5
6z = 6
z = 6 : 6
z = 1
8y − 4y − 12 = −50
4y = −50 + 12
4y = −38
y = −38 : 4
y = −9,5
−10 + x + x = −26
2x = −26 + 10
2x = −16
x = −16 : 2
x = −8
10y − 3y − 9 = 40
7y = 40 + 9
7y = 49
y = 49 : 7
y = 7
−y + 8 − 14y = 23
−15y = 23 − 8
−15y = 15
y = 15 : (−15)
y = −1
