27. If P = -(x-2), Q = -2(y+1) and R= -x+2y, find a, when P+Q+R = ax.
28. If A = 3x2-4X+1, b = 5x²+3x-8 and C = 4x2-7x+3 then find:
a.(A+B)-C
b.B+C-A
c.A+B+C
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an exact copy of something
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