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2+3 = z+z
5= 2z
z= 5/2
z= 2,5
b) 3a - 2= -a+18
3a+a = 18+2
4a = 20
a = 20/4
a= 5
c) 1/2(4x+2) = 3
2x +1 = 3
2x = 3+1
2x =4
x = 4/2
x = 2
d) 2a -1 = 3a - 5
2a - 3a = -5+1
-a= -4
a = 4
e) 2 (3x-1) = 2(2x+3)
6x-2 = 4x+6
6x-4x = 6+2
2x = 8
x = 8/2
x = 4
f) 3q-1 = q+3
3q-q = 3+1
2q = 4
q = 4/2
q=2