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2a + b = 7
_________ -
2a = 12
a = 6
masukkan nilai a=6 ke persamaan
(2x6 ) +b = 7
12 + b = 7
b =
jika x = -10 maka 6(-10) - 5 = -65
x = 5 maka 6x5 - 5 = 25