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3x + 5y = 78 |x2| 6x + 10y = 156 -
14y = 15
y =
Substitusi nilai y tersebut ke salah satu persamaan:
3x + 5y = 78
3x + 5() = 78
3x + = 78 (kedua ruas dikali 14)
42x + 75 = 1092
42x = 1092 - 75
42x = 1017
x =