Question 625491
(4x + 5y) + (3x+8y) 


4x + 5y + 3x+8y


(4x+ 3x) + (5y +8y)


(4+ 3)x + (5 +8)y


(7)x + (13)y


7x + 13y


So (4x + 5y) + (3x+8y)  simplifies to <font color="red">7x + 13y</font>

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