7x+4x=121 2y+7y+78=1581 357z-149z-1843=11969 20a-6a+14=28

Предыдущий
вопрос Следующий
вопрос

The solutions to the given equations are as follows:

1) 7x + 4x = 121
11x = 121
x = 121 / 11
x = 11

2) 2y + 7y + 78 = 1581
9y + 78 = 1581
9y = 1503
y = 1503 / 9
y = 167

3) 357z - 149z - 1843 = 11969
208z - 1843 = 11969
208z = 13812
z = 13812 / 208
z = 66.5

4) 20a - 6a + 14 = 28
14a + 14 = 28
14a = 14
a = 14 / 14
a = 1