5y
explanaition 5x-5x=0, 0-2y=-2y, -2y+7y=5y
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7y + 4 - 4 - 9 = 7y - 9
Yes it is.
It can be simplified to: 3+y
4X2+X3+3X+7Y+2X3 can only be simplified to 3X3+4X2+3X+7Y, because X3 and 2X3 are the only like terms.
The given expression can be simplified to: x-12y