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2 +3= z+z
5 = 2z
5/2 = z
2,5 = z
z+z = 2+3
2z = 5
z= 5/2
z = 2,5
j. 3a-2 = -a+18
3a+a = 18+2
4a = 20
a = 20/4
a = 5
k. ½(4x + 2 ) = 3
2x+1 = 3
2x = 3-1
x = 2/2
x = 1