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x+5y = 7 .....dikali 3
menjadi :
3x + 15y = 21
3x - 2y = 12 -
17y = 9
y = 9/17
subtitusi nilai y
x+5(9/17) = 7
x + 45/17 = 7
x = 119 - 45/17
x = 74/7
x = 10 4/7