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b. 2a -3b +3a - 2b=5a-5b
c. 2y -6y + 4x - 2x= -4y+2x
d. 2x + 3 - 6x - 10= -4x -7
e. -x + 2x + [-6] + x - 4 =-x+2x-6+x-4= 2x -10
f. 2ab - 6 - ab - [-3]= 2ab-6-ab+3=ab -3
g. 3x² - 2y² - 6x² - 2y²= -3x² - 4y²
h. 3,5b - 2,4c - 0,6c - 0,5b= 3b - 3c
i. 3x² - 2x + 1 + x - 4x² - 2= -x² -x -1
j. 2m² + 3mn - n + mn +3n - m²= m² +4mn +2n