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a. 2x^ + 4x - 7 = 0
b. y^ - 7y - 4 = 0
c. 4x^ + 5x + 1 = 0
d. 7y^ - 4y + 2 = 0
e. z + x + 19 = 0
f. 7a - 8b - 23 = 0
g.9e + 5x + 7 = 0
h. a + b - 2 = 0
i. 23x - 15y - 7 = 0
j. 8x^ + 17x - 6 = 0
catatan :
tanda "^" = pangkat 2/ kuadrat