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To simplify Y plus Y, you can combine the like terms. In this case, both Y terms are like terms because they have the same variable. When you add them together, you get 2Y. Therefore, Y plus Y simplifies to 2Y.
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6 - y + 5y - 6y = 6 - 2y
you can't simplify that anymore, you have to know what either x or y equals
5x+2x-3y+y = (5+2)x+(-3+1)y = 7x - 2y