if p=3+7x+8, Q=2+x -9 and R= -5 -8 +1, show that P+Q+R=0
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P = 7x + 11
Q = x - 7
R = - 12
P + Q + R = 7x + 11 + x - 7 - 12 = 8x + 4
8x+ 4 = 0
8x = - 4
X = - 4 /8 = - 1/2
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