Answer:
-1/2y + 3
Explanation:
group like terms:
2/5y - 9/10y - 4 + 7
factor out y:
y (2/5 - 9/10) - 4 + 7
add the numbers:
y (2/5 - 9/10) + 3
simplify:
y (-1/2) + 3
= -1/2y + 3
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