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2 = (- 2a - a)/(- 4 + 1)
2 = - 3a/ - 3
2 = a
x₂ -x₁
2 = -2a -a
-4 -(-1)
2 = -3a
-3
-3(2) = 1(-3a)
-6 = -3a
a = -6/-3
a = 2
Jadi, nilai dari a adalah 2.