Question
Add : $23 y^2, 8 y^2$ and $-12 y^2$
✓
Answer
$23 y^2, 8 y^2$ and $-12 y^2$
$=31 y^2-12 y^2=19 y^2$
$=31 y^2-12 y^2=19 y^2$
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