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b. x+2y-2+2x-y+3z= 3x +y -2+3z
c. 4 - 2a -6b +5a +3b -2 = 2+3a-3b
a. 10p -8 - (8p-10) = 10p -8 -8p +10 = 2p +2
b. 2 - 10 m +15 m - (m (3n+5)) = 2 +5m - 3mn -5m = 2 -3mn
c. 40xy -72yz - (5x (8y-9z)) = 40xy -72yz -40xy +45 xz = -72yz +45xz