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2. a) a +b + 2a = 3a + b
b) 1,5x + 0,5y - 0,75x - 0,25y + 0,25x =
x + 0,25y
3. 4x + 3z - 5y - 2
4*3 + 3*4 - 5*2 - 2 = 12 + 12 - 10 -2 = 12
4. 12x - 8y + 3y - 7x + 5y = 5x
5*5 = 25