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Mathematics 9 Online
OpenStudy (anonymous):

(4y^2+y+5)+-y^2-3y+4)

OpenStudy (anonymous):

(4y^2+y+5)+(-y^2-3y+4) u missed a braquet, so it would be (4y^2+y+5-y^2-3y+4) =2y^2-2y+20

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