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6x+8y=74
________-
)))))))))y=(-6)
6x+9y=68
6x+9(-6)=68
6x+(-54)=68
6x=68+54
x=122/6
6x = 68 - 9y
x = (68 - 9y) : 6
6x + 8y = 74
6((68 - 9y) : 6) + 8y = 74
68 - 9y + 8y = 74
-y = 74 - 68
-y = 6
y = -6
6x + 9y = 68
6x + 9(-6) = 68
6x + (-54) = 68
6x = 68 + 54
x = 122 : 6 = 20 2/6 = 20 1/3
mohon dibetulkan klo ada salah