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ax² + 3x + 6 = 2x - 1
ax² + 3x + 6 - 2x + 1 = 0
ax² + x + 7 = 0
D = -27
1 - 4.a.7 = -27
-28a = -27-1
-28a = -28
a = 1
a+1 = 1+1 = 2