Question

3(z + 1) + 4(z – 3) = 5

Answer 1

3z + 3 + 4z -12 = 5
add like terms:
7z - 9 = 5

Answer 2

3z+3+4z-12=5
7z-9=5
7z=5+9
7z=14
z=2

Answer 3

3*z=3z
3*1=3
+
4*z=4z
4*-3=-12
sooo 3z+3+4z-12=5

Answer 4

and then..

Answer 5

3z+4z =7z
3-12=-9
sooo 7z-9=5

Answer 6

then..
7z-9=5 +9
7z=14 /7
z=2

Answer 7

thank you