please don't spam please
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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
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