Question

please don't spam please​

Answer 1

Answer:

Please mark as brainliest

Step-by-step explanation:

First add the three sides

Let fourth side be a

(3x2y + 4xyz -12) + (12x2y + 7xyz +50) + (15x2y + 3xyz -7x) + a

30x2y +14xyz +38 - 7x + a = 30x2y + 9xyz - 15x + 100

-5xyz +a = 22x + 62

a= 5xyz + 22x + 62