Add (15x-121x^12+x^9-x^7+3x^2)+(x^7-68x^2-x^9)

Math
(15x-121×12+x9-x7+3×2)+(x7-68×2-x9)
Remove parentheses.
15x-121×12+x9-x7+3×2+x7-68×2-x9
Combine the opposite terms in 15x-121×12+x9-x7+3×2+x7-68×2-x9.
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Add -x7 and x7.
15x-121×12+x9+3×2+0-68×2-x9
Add 15x-121×12+x9+3×2 and 0.
15x-121×12+x9+3×2-68×2-x9
Subtract x9 from x9.
15x-121×12+3×2-68×2+0
Add 15x-121×12+3×2-68×2 and 0.
15x-121×12+3×2-68×2
15x-121×12+3×2-68×2
Subtract 68×2 from 3×2.
15x-121×12-65×2
Add (15x-121x^12+x^9-x^7+3x^2)+(x^7-68x^2-x^9)

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