Simplify the following by combining the like terms
(a) 3x2yz2 – 3xy2z + x2yz2 + 7xy2z
(b) x4 + 3x3y + 3x2y2 – 3x3y – 3xy3 + y4 – 3x2y2
(c) p3q2r + pq2r3 + 3p2qr2 – 9p2qr2
(d) 2a + 2b + 2c – 2a – 2b – 2c – 2b + 2c + 2a
(e) 50x3 – 21x + 107 + 41x3 – x + 1 – 93 + 71x – 31x3
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