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8a²+b²=2(8a²+b²)/2
8a²+b²=8a²+b²
b) 64a³-125x³=(128a⁴x-250ax⁴)/2ax
64a³-125x³=2ax(64a³-125x³)/2ax
64a³-125x³=64a³-125x
c) (7x-3)²=49x²-42x+9
49x²-42x+9=49x²-42x+9
d) (2a+2c)²=9a²+12ac+4c²
9a²+12ac+4c²=9a²+12ac+4c²