2x+3x+4=14
2 * x + 3 * x = 14 - 4
5 * x = 10
x = 10 / 5
x = 2
7z-z+5=11
7 * z - z = 11 - 5
6 * z = 6
z = 6 / 6
z = 1
8y-4y-12=-50
8 * y - 4 * y = - 50 + 12
4 * y = - 38
y = - 38 / 4
y = - 9,5
2x+3x+4=14
2 * x + 3 * x = 14 - 4
5 * x = 10
x = 10 / 5
x = 2
7z-z+5=11
7 * z - z = 11 - 5
6 * z = 6
z = 6 / 6
z = 1
8y-4y-12=-50
8 * y - 4 * y = - 50 + 12
4 * y = - 38
y = - 38 / 4
y = - 9,5