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a)
3(5x - 4y)
= 15x - 12y
b)
4y(y + 2y^2)
= 4y^2 + 8y^3
c)
2a(3a - b + 1)
= 6a^2 - 2ab + 2a
d)
x(1 + 2x - y)
= x + 2x^2 - xy