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2x + 3y = 4 +
3x = -3
x = -3/3
x = -1
x - 3y = -7
(-1) - 3y = - 7
-3y = -7 + 1
-3y = 6
y = 6/-3
y = -2
Nilai dari 3x - 2y :
3(-1) - 2(-2)
= -3 + 4
= -1