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2x + 4 = 0
2x = -4
x= -2
atau
x+4=0
x= -4
Rumus:
Syarat : p x q = ac
p + q =b
... x ... = 24 } 8 x 3 = 24
... + ... = 11 } 8 + 3 = 11
subtitusikan (masukin)