The solutions to the given equations are as follows:
1) 7x + 4x = 1211x = 12x = 121 / 1x = 11
2) 2y + 7y + 78 = 1589y + 78 = 1589y = 150y = 1503 / y = 167
3) 357z - 149z - 1843 = 1196208z - 1843 = 1196208z = 1381z = 13812 / 20z = 66.5
4) 20a - 6a + 14 = 214a + 14 = 214a = 1a = 14 / 1a = 1
The solutions to the given equations are as follows:
1) 7x + 4x = 12
11x = 12
x = 121 / 1
x = 11
2) 2y + 7y + 78 = 158
9y + 78 = 158
9y = 150
y = 1503 /
y = 167
3) 357z - 149z - 1843 = 1196
208z - 1843 = 1196
208z = 1381
z = 13812 / 20
z = 66.5
4) 20a - 6a + 14 = 2
14a + 14 = 2
14a = 1
a = 14 / 1
a = 1