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(-3)² + (c+6)-3 + c - 5 = 0
9 -3c - 18 + c - 5 = 0
-2c - 14 = 0
-2c = 14
c = -7
sub. nilai c
x² + (-7 + 6)x -7 - 5 = 0
x² - x -12 = 0
(x+3)(x-4) = 0
Maka akar yang lain adalah 4