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b) -4/7y
c) -2/5a
d) -0,75w
e) 1 4/7z
f) -2,4z
g) 2,5y + 0,8y = 3,3y
h) 1 2/3y + y = 2 2/3y
i) -1 1/4x - 2x = -3 1/4x