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b) 3(x^2 - 2 ) - (5-6x^2) = 3x²-6-5+6x²=9x²-11
c) -3(1-2y) + 1/2 (6-12y) = -3+6y+3-6y=0
d) - (x-2) - 4 (1/2 - x) = -x+2-3+x=-1