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5x+2y-3z+8+2x-3y+5z-15
5x+2x+2y-3y-3z+5z+8-15 = 7x-y+2z-7
b. 3(2a+b)-2(-4a+2b) =
6a+3b+8a-4b
6a+8a+3b-4b = 14a-b