Simplify: 6y²+7y - 6y - 4 - 3y²
The first step is to group the terms of the equation into y² terms, y terms and terms with no y:
This gives, 6y²-3y² + 7y - 6y - 4
Next we are going to look at each term individually:Looking at only the y² terms: 6y²-3y²= (6-3)y² = 3y²
Looking at only the y terms: 7y - 6y = (7-6)y = 1y = y
Looking at the final term: -4 (this can not be simplified any further so is left as it is).
Finally we bring all of the terms back together to give: 6y²+7y - 6y - 4 - 3y²= 3y² + y - 4

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Simplify fully:6y2 +7y - 6y - 4 - 3y2

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