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a * (b + c) = a*b + a*c
a) 3(5 - 4y) = 3*5 - 3*4y = 15 - 12y
b) 2a(3a - b + 1) = 2a*3a - 2a*b + 2a*1 = 6a² - 2ab + 2a
c) -y (1 + 2) = -y*1 + (-y)*2 = - y - 2y = -3y