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Answer:
3x⁴ + x³ + 3 x² - 18 x + 4
Step-by-step explanation:
x = 80
Let x be the unknown number
1/2 x - 10 = 30
Add 10 to each side
1/2x -10+10 = 30+10
1/2x = 40
Multiply each side by 2
1/2x * 2 = 40*2
