Hey there!
1.5z + 4.5 + 6z - 0.3 - 3z + z
= 1.5z + 4.5 + 6z - 0.3 - 3z + 1z
COMBINE the LIKE TERMS
= (1.5z + 6z - 3z + 1z) + (4.5 - 0.3)
= (7.5z - 3z + 1z) + (4.5 - 0.3)
= (4.5z + 1z) + (4.5 - 0.3)
= (5.5z) + (4.5 - 0.3)
= 5.5z + (4.2)
= 5.5z + 4.2
Therefore, your answer is: 5.5z + 4.2
Good luck on your assignment and enjoy day!
~Amphitrite1040:)
